51520235 has 16 divisors (see below), whose sum is σ = 68132064. Its totient is φ = 37158912.

The previous prime is 51520219. The next prime is 51520247. The reversal of 51520235 is 53202515.

It is a cyclic number.

It is not a de Polignac number, because 51520235 - 2⁴ = 51520219 is a prime.

It is a super-2 number, since 2×51520235² = 5308669228910450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51520235.

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, 6422 + ... + 12011.

It is an arithmetic number, because the mean of its divisors is an integer number (4258254).

Almost surely, 2^51520235 is an apocalyptic number.

51520235 is a deficient number, since it is larger than the sum of its proper divisors (16611829).

51520235 is a wasteful number, since it uses less digits than its factorization.

51520235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18494.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51520235 is about 7177.7597479994. The cubic root of 51520235 is about 372.0996644934.

The spelling of 51520235 in words is "fifty-one million, five hundred twenty thousand, two hundred thirty-five".