51808497 has 32 divisors (see below), whose sum is σ = 79027200. Its totient is φ = 29927232.

The previous prime is 51808457. The next prime is 51808499. The reversal of 51808497 is 79480815.

It is not a de Polignac number, because 51808497 - 2⁶ = 51808433 is a prime.

It is a super-2 number, since 2×51808497² = 5368240722798018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51808499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102748 + ... + 103250.

It is an arithmetic number, because the mean of its divisors is an integer number (2469600).

Almost surely, 2^51808497 is an apocalyptic number.

51808497 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

51808497 is a deficient number, since it is larger than the sum of its proper divisors (27218703).

51808497 is a wasteful number, since it uses less digits than its factorization.

51808497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 51808497 is about 7197.8119591998. The cubic root of 51808497 is about 372.7923552045.

The spelling of 51808497 in words is "fifty-one million, eight hundred eight thousand, four hundred ninety-seven".