51919531 has 4 divisors (see below), whose sum is σ = 52650864. Its totient is φ = 51188200.

The previous prime is 51919507. The next prime is 51919583. The reversal of 51919531 is 13591915.

51919531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13591915 = 5 ⋅2718383.

It is a cyclic number.

It is not a de Polignac number, because 51919531 - 2⁵ = 51919499 is a prime.

It is a super-2 number, since 2×51919531² = 5391275398519922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51919591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365560 + ... + 365701.

It is an arithmetic number, because the mean of its divisors is an integer number (13162716).

Almost surely, 2^51919531 is an apocalyptic number.

51919531 is a deficient number, since it is larger than the sum of its proper divisors (731333).

51919531 is an equidigital number, since it uses as much as digits as its factorization.

51919531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731332.

The product of its digits is 6075, while the sum is 34.

The square root of 51919531 is about 7205.5208694445. The cubic root of 51919531 is about 373.0584833080.

The spelling of 51919531 in words is "fifty-one million, nine hundred nineteen thousand, five hundred thirty-one".