51531425 has 12 divisors (see below), whose sum is σ = 69708336. Its totient is φ = 37477200.

The previous prime is 51531419. The next prime is 51531427. The reversal of 51531425 is 52413515.

It is a de Polignac number, because none of the positive numbers 2^k-51531425 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51531394 and 51531403.

It is not an unprimeable number, because it can be changed into a prime (51531427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93419 + ... + 93968.

It is an arithmetic number, because the mean of its divisors is an integer number (5809028).

Almost surely, 2^51531425 is an apocalyptic number.

51531425 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51531425 is a deficient number, since it is larger than the sum of its proper divisors (18176911).

51531425 is a wasteful number, since it uses less digits than its factorization.

51531425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187408 (or 187403 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 51531425 is about 7178.5391968004. The cubic root of 51531425 is about 372.1266020894.

The spelling of 51531425 in words is "fifty-one million, five hundred thirty-one thousand, four hundred twenty-five".