251255436 has 12 divisors (see below), whose sum is σ = 586262712. Its totient is φ = 83751808.

The previous prime is 251255399. The next prime is 251255437. The reversal of 251255436 is 634552152.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 251255397 and 251255406.

It is not an unprimeable number, because it can be changed into a prime (251255437) 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 3 ways as a sum of consecutive naturals, for example, 10468965 + ... + 10468988.

It is an arithmetic number, because the mean of its divisors is an integer number (48855226).

Almost surely, 2^251255436 is an apocalyptic number.

It is an amenable number.

251255436 is an abundant number, since it is smaller than the sum of its proper divisors (335007276).

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

251255436 is a wasteful number, since it uses less digits than its factorization.

251255436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20937960 (or 20937958 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The square root of 251255436 is about 15851.0389564848. The cubic root of 251255436 is about 631.0132648744.

The spelling of 251255436 in words is "two hundred fifty-one million, two hundred fifty-five thousand, four hundred thirty-six".