51997907 has 8 divisors (see below), whose sum is σ = 56370720. Its totient is φ = 47678400.

The previous prime is 51997903. The next prime is 51997909. The reversal of 51997907 is 70979915.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51997907 - 2² = 51997903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51997901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11282 + ... + 15207.

It is an arithmetic number, because the mean of its divisors is an integer number (7046340).

Almost surely, 2^51997907 is an apocalyptic number.

51997907 is a deficient number, since it is larger than the sum of its proper divisors (4372813).

51997907 is a wasteful number, since it uses less digits than its factorization.

51997907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26653.

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 51997907 is about 7210.9574260288. The cubic root of 51997907 is about 373.2461078287.

The spelling of 51997907 in words is "fifty-one million, nine hundred ninety-seven thousand, nine hundred seven".