51531943 has 2 divisors, whose sum is σ = 51531944. Its totient is φ = 51531942.

The previous prime is 51531919. The next prime is 51531989. The reversal of 51531943 is 34913515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51531943 is a prime.

It is a super-2 number, since 2×51531943² = 5311082298710498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51531143) 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 as a sum of consecutive naturals, namely, 25765971 + 25765972.

It is an arithmetic number, because the mean of its divisors is an integer number (25765972).

Almost surely, 2^51531943 is an apocalyptic number.

51531943 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531943 is an equidigital number, since it uses as much as digits as its factorization.

51531943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 51531943 is about 7178.5752764737. The cubic root of 51531943 is about 372.1278489722.

The spelling of 51531943 in words is "fifty-one million, five hundred thirty-one thousand, nine hundred forty-three".