51392121 has 8 divisors (see below), whose sum is σ = 74752224. Its totient is φ = 31146720.

The previous prime is 51392113. The next prime is 51392129. The reversal of 51392121 is 12129315.

It is an interprime number because it is at equal distance from previous prime (51392113) and next prime (51392129).

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

It is not a de Polignac number, because 51392121 - 2³ = 51392113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51392091 and 51392100.

It is not an unprimeable number, because it can be changed into a prime (51392129) 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, 778636 + ... + 778701.

It is an arithmetic number, because the mean of its divisors is an integer number (9344028).

Almost surely, 2^51392121 is an apocalyptic number.

It is an amenable number.

51392121 is a deficient number, since it is larger than the sum of its proper divisors (23360103).

51392121 is a wasteful number, since it uses less digits than its factorization.

51392121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557351.

The product of its digits is 540, while the sum is 24.

The square root of 51392121 is about 7168.8298208285. The cubic root of 51392121 is about 371.7909783671.

It can be divided in two parts, 5139 and 2121, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 51392121 in words is "fifty-one million, three hundred ninety-two thousand, one hundred twenty-one".