51970591 has 4 divisors (see below), whose sum is σ = 52002184. Its totient is φ = 51939000.

The previous prime is 51970577. The next prime is 51970603. The reversal of 51970591 is 19507915.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51970591 - 2¹⁷ = 51839519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51970591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51970511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13185 + ... + 16666.

It is an arithmetic number, because the mean of its divisors is an integer number (13000546).

Almost surely, 2^51970591 is an apocalyptic number.

51970591 is a deficient number, since it is larger than the sum of its proper divisors (31593).

51970591 is a wasteful number, since it uses less digits than its factorization.

51970591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31592.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 51970591 is about 7209.0631152737. The cubic root of 51970591 is about 373.1807373992.

The spelling of 51970591 in words is "fifty-one million, nine hundred seventy thousand, five hundred ninety-one".