51399369 has 36 divisors (see below), whose sum is σ = 86646976. Its totient is φ = 28759104.

The previous prime is 51399317. The next prime is 51399377. The reversal of 51399369 is 96399315.

It is not a de Polignac number, because 51399369 - 2¹⁶ = 51333833 is a prime.

It is a super-2 number, since 2×51399369² = 5283790267196322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399169) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 498972 + ... + 499074.

Almost surely, 2^51399369 is an apocalyptic number.

It is an amenable number.

51399369 is a deficient number, since it is larger than the sum of its proper divisors (35247607).

51399369 is a wasteful number, since it uses less digits than its factorization.

51399369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 202 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 51399369 is about 7169.3353248401. The cubic root of 51399369 is about 371.8084558473.

The spelling of 51399369 in words is "fifty-one million, three hundred ninety-nine thousand, three hundred sixty-nine".