1251321404 has 6 divisors (see below), whose sum is σ = 2189812464. Its totient is φ = 625660700.

The previous prime is 1251321391. The next prime is 1251321427. The reversal of 1251321404 is 4041231521.

It is a super-2 number, since 2×1251321404² = 3131610512217062432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251321404.

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, 156415172 + ... + 156415179.

It is an arithmetic number, because the mean of its divisors is an integer number (364968744).

Almost surely, 2^1251321404 is an apocalyptic number.

It is an amenable number.

1251321404 is a deficient number, since it is larger than the sum of its proper divisors (938491060).

1251321404 is a wasteful number, since it uses less digits than its factorization.

1251321404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312830355 (or 312830353 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1251321404 is about 35374.0215977771. The cubic root of 1251321404 is about 1077.5967951544.

Adding to 1251321404 its reverse (4041231521), we get a palindrome (5292552925).

The spelling of 1251321404 in words is "one billion, two hundred fifty-one million, three hundred twenty-one thousand, four hundred four".