51311006402 has 16 divisors (see below), whose sum is σ = 77755828920. Its totient is φ = 25392901248.

The previous prime is 51311006389. The next prime is 51311006413. The reversal of 51311006402 is 20460011315.

It can be written as a sum of positive squares in 4 ways, for example, as 49212541921 + 2098464481 = 221839^2 + 45809^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78668 + ... + 329864.

Almost surely, 2^51311006402 is an apocalyptic number.

51311006402 is a deficient number, since it is larger than the sum of its proper divisors (26444822518).

51311006402 is a wasteful number, since it uses less digits than its factorization.

51311006402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252245.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 51311006402 its reverse (20460011315), we get a palindrome (71771017717).

The spelling of 51311006402 in words is "fifty-one billion, three hundred eleven million, six thousand, four hundred two".