51831377 has 4 divisors (see below), whose sum is σ = 55818420. Its totient is φ = 47844336.

The previous prime is 51831371. The next prime is 51831379. The reversal of 51831377 is 77313815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77313815 = 5 ⋅15462763.

It can be written as a sum of positive squares in 2 ways, for example, as 8059921 + 43771456 = 2839^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 51831377 - 2⁴ = 51831361 is a prime.

It is a super-2 number, since 2×51831377² = 5372983283432258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51831371) 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, 1993502 + ... + 1993527.

It is an arithmetic number, because the mean of its divisors is an integer number (13954605).

Almost surely, 2^51831377 is an apocalyptic number.

It is an amenable number.

51831377 is a deficient number, since it is larger than the sum of its proper divisors (3987043).

51831377 is a wasteful number, since it uses less digits than its factorization.

51831377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987042.

The product of its digits is 17640, while the sum is 35.

The square root of 51831377 is about 7199.4011556518. The cubic root of 51831377 is about 372.8472254431.

The spelling of 51831377 in words is "fifty-one million, eight hundred thirty-one thousand, three hundred seventy-seven".