251063340 has 96 divisors (see below), whose sum is σ = 807287040. Its totient is φ = 57657600.

The previous prime is 251063333. The next prime is 251063347. The reversal of 251063340 is 43360152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (251063333) and next prime (251063347).

It is a self number, because there is not a number n which added to its sum of digits gives 251063340.

It is not an unprimeable number, because it can be changed into a prime (251063347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2530 + ... + 22550.

It is an arithmetic number, because the mean of its divisors is an integer number (8409240).

Almost surely, 2^251063340 is an apocalyptic number.

251063340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251063340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403643520).

251063340 is an abundant number, since it is smaller than the sum of its proper divisors (556223700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251063340 is a wasteful number, since it uses less digits than its factorization.

251063340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20063 (or 20061 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 251063340 is about 15844.9783843336. The cubic root of 251063340 is about 630.8524112684.

The spelling of 251063340 in words is "two hundred fifty-one million, sixty-three thousand, three hundred forty".