51089409 has 18 divisors (see below), whose sum is σ = 85844850. Its totient is φ = 29193696.

The previous prime is 51089359. The next prime is 51089413. The reversal of 51089409 is 90498015.

51089409 = 997² + 998² + ... + 1045².

It can be written as a sum of positive squares in only one way, i.e., 48608784 + 2480625 = 6972^2 + 1575^2 .

It is not a de Polignac number, because 51089409 - 2⁸ = 51089153 is a prime.

It is a super-2 number, since 2×51089409² = 5220255423938562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51089419) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 57484 + ... + 58365.

Almost surely, 2^51089409 is an apocalyptic number.

It is an amenable number.

51089409 is a deficient number, since it is larger than the sum of its proper divisors (34755441).

51089409 is a wasteful number, since it uses less digits than its factorization.

51089409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115869 (or 115859 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 51089409 is about 7147.6855694693. The cubic root of 51089409 is about 371.0595608659.

The spelling of 51089409 in words is "fifty-one million, eighty-nine thousand, four hundred nine".