51531427 has 2 divisors, whose sum is σ = 51531428. Its totient is φ = 51531426.

The previous prime is 51531419. The next prime is 51531433. The reversal of 51531427 is 72413515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51531427 - 2³ = 51531419 is a prime.

It is a Chen prime.

It is equal to p_3087424 and since 51531427 and 3087424 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 51531395 and 51531404.

It is not a weakly prime, because it can be changed into another prime (51531407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765713 + 25765714.

It is an arithmetic number, because the mean of its divisors is an integer number (25765714).

Almost surely, 2^51531427 is an apocalyptic number.

51531427 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531427 is an equidigital number, since it uses as much as digits as its factorization.

51531427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 51531427 is about 7178.5393361045. The cubic root of 51531427 is about 372.1266069036.

The spelling of 51531427 in words is "fifty-one million, five hundred thirty-one thousand, four hundred twenty-seven".