51397669 has 2 divisors, whose sum is σ = 51397670. Its totient is φ = 51397668.

The previous prime is 51397639. The next prime is 51397693. The reversal of 51397669 is 96679315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27436644 + 23961025 = 5238^2 + 4895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51397669 is a prime.

It is a super-2 number, since 2×51397669² = 5283440757267122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51397609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25698834 + 25698835.

It is an arithmetic number, because the mean of its divisors is an integer number (25698835).

Almost surely, 2^51397669 is an apocalyptic number.

It is an amenable number.

51397669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51397669 is an equidigital number, since it uses as much as digits as its factorization.

51397669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 46.

The square root of 51397669 is about 7169.2167633571. The cubic root of 51397669 is about 371.8043566962.

The spelling of 51397669 in words is "fifty-one million, three hundred ninety-seven thousand, six hundred sixty-nine".