251405402132 has 6 divisors (see below), whose sum is σ = 439959453738. Its totient is φ = 125702701064.

The previous prime is 251405402107. The next prime is 251405402179. The reversal of 251405402132 is 231204504152.

It can be written as a sum of positive squares in only one way, i.e., 250644414736 + 760987396 = 500644^2 + 27586^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251405402095 and 251405402104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31425675263 + ... + 31425675270.

It is an arithmetic number, because the mean of its divisors is an integer number (73326575623).

Almost surely, 2^251405402132 is an apocalyptic number.

It is an amenable number.

251405402132 is a deficient number, since it is larger than the sum of its proper divisors (188554051606).

251405402132 is a wasteful number, since it uses less digits than its factorization.

251405402132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62851350537 (or 62851350535 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 251405402132 its reverse (231204504152), we get a palindrome (482609906284).

The spelling of 251405402132 in words is "two hundred fifty-one billion, four hundred five million, four hundred two thousand, one hundred thirty-two".