51785731 has 2 divisors, whose sum is σ = 51785732. Its totient is φ = 51785730.

The previous prime is 51785693. The next prime is 51785777. The reversal of 51785731 is 13758715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51785731 - 2⁷ = 51785603 is a prime.

It is a super-2 number, since 2×51785731² = 5363523870408722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51785131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25892865 + 25892866.

It is an arithmetic number, because the mean of its divisors is an integer number (25892866).

Almost surely, 2^51785731 is an apocalyptic number.

51785731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51785731 is an equidigital number, since it uses as much as digits as its factorization.

51785731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 37.

The square root of 51785731 is about 7196.2303326117. The cubic root of 51785731 is about 372.7377423212.

The spelling of 51785731 in words is "fifty-one million, seven hundred eighty-five thousand, seven hundred thirty-one".