51690947 has 16 divisors (see below), whose sum is σ = 64603392. Its totient is φ = 40180320.

The previous prime is 51690943. The next prime is 51690949. The reversal of 51690947 is 74909615.

It is a cyclic number.

It is not a de Polignac number, because 51690947 - 2² = 51690943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51690941) 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, 60173 + ... + 61025.

It is an arithmetic number, because the mean of its divisors is an integer number (4037712).

Almost surely, 2^51690947 is an apocalyptic number.

51690947 is a deficient number, since it is larger than the sum of its proper divisors (12912445).

51690947 is a wasteful number, since it uses less digits than its factorization.

51690947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 51690947 is about 7189.6416461462. The cubic root of 51690947 is about 372.5101947572.

The spelling of 51690947 in words is "fifty-one million, six hundred ninety thousand, nine hundred forty-seven".