51497709 has 16 divisors (see below), whose sum is σ = 73389888. Its totient is φ = 32006912.

The previous prime is 51497701. The next prime is 51497711. The reversal of 51497709 is 90779415.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51497709 - 2³ = 51497701 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (51497701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739 + ... + 10175.

It is an arithmetic number, because the mean of its divisors is an integer number (4586868).

Almost surely, 2^51497709 is an apocalyptic number.

It is an amenable number.

51497709 is a deficient number, since it is larger than the sum of its proper divisors (21892179).

51497709 is a wasteful number, since it uses less digits than its factorization.

51497709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9564.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 51497709 is about 7176.1904238948. The cubic root of 51497709 is about 372.0454260055.

The spelling of 51497709 in words is "fifty-one million, four hundred ninety-seven thousand, seven hundred nine".