51539851 has 4 divisors (see below), whose sum is σ = 56225304. Its totient is φ = 46854400.

The previous prime is 51539821. The next prime is 51539879. The reversal of 51539851 is 15893515.

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 51539851 - 2⁵ = 51539819 is a prime.

It is a super-2 number, since 2×51539851² = 5312712482204402, which contains 22 as substring.

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 51539851.

It is not an unprimeable number, because it can be changed into a prime (51539821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342710 + ... + 2342731.

It is an arithmetic number, because the mean of its divisors is an integer number (14056326).

Almost surely, 2^51539851 is an apocalyptic number.

51539851 is a deficient number, since it is larger than the sum of its proper divisors (4685453).

51539851 is a wasteful number, since it uses less digits than its factorization.

51539851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685452.

The product of its digits is 27000, while the sum is 37.

The square root of 51539851 is about 7179.1260610188. The cubic root of 51539851 is about 372.1468833570.

The spelling of 51539851 in words is "fifty-one million, five hundred thirty-nine thousand, eight hundred fifty-one".