51499745 has 16 divisors (see below), whose sum is σ = 69242688. Its totient is φ = 36440640.

The previous prime is 51499727. The next prime is 51499769. The reversal of 51499745 is 54799415.

It is not a de Polignac number, because 51499745 - 2¹⁶ = 51434209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51499696 and 51499705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10619 + ... + 14688.

It is an arithmetic number, because the mean of its divisors is an integer number (4327668).

Almost surely, 2^51499745 is an apocalyptic number.

51499745 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51499745 is a deficient number, since it is larger than the sum of its proper divisors (17742943).

51499745 is a wasteful number, since it uses less digits than its factorization.

51499745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25360.

The product of its digits is 226800, while the sum is 44.

The square root of 51499745 is about 7176.3322804898. The cubic root of 51499745 is about 372.0503289712.

The spelling of 51499745 in words is "fifty-one million, four hundred ninety-nine thousand, seven hundred forty-five".