251402130 has 160 divisors (see below), whose sum is σ = 781989120. Its totient is φ = 56764800.

The previous prime is 251402117. The next prime is 251402143. The reversal of 251402130 is 31204152.

251402130 is a `hidden beast` number, since 251 + 402 + 13 + 0 = 666.

251402130 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251402117) and next prime (251402143).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 572451 + ... + 572889.

It is an arithmetic number, because the mean of its divisors is an integer number (4887432).

Almost surely, 2^251402130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251402130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390994560).

251402130 is an abundant number, since it is smaller than the sum of its proper divisors (530586990).

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

251402130 is a wasteful number, since it uses less digits than its factorization.

251402130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 251402130 is about 15855.6655489450. The cubic root of 251402130 is about 631.1360454365.

Adding to 251402130 its reverse (31204152), we get a palindrome (282606282).

The spelling of 251402130 in words is "two hundred fifty-one million, four hundred two thousand, one hundred thirty".