51578113 has 4 divisors (see below), whose sum is σ = 52777648. Its totient is φ = 50378580.

The previous prime is 51578089. The next prime is 51578159. The reversal of 51578113 is 31187515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31187515 = 5 ⋅6237503.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51578113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51578183) 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, 599703 + ... + 599788.

It is an arithmetic number, because the mean of its divisors is an integer number (13194412).

Almost surely, 2^51578113 is an apocalyptic number.

It is an amenable number.

51578113 is a deficient number, since it is larger than the sum of its proper divisors (1199535).

51578113 is a wasteful number, since it uses less digits than its factorization.

51578113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199534.

The product of its digits is 4200, while the sum is 31.

The square root of 51578113 is about 7181.7903756654. The cubic root of 51578113 is about 372.2389516734.

The spelling of 51578113 in words is "fifty-one million, five hundred seventy-eight thousand, one hundred thirteen".