73157731 has 2 divisors, whose sum is σ = 73157732. Its totient is φ = 73157730.

The previous prime is 73157717. The next prime is 73157743. The reversal of 73157731 is 13775137.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73157731 - 2⁹ = 73157219 is a prime.

It is a super-2 number, since 2×73157731² = 10704107210136722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73157701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36578865 + 36578866.

It is an arithmetic number, because the mean of its divisors is an integer number (36578866).

Almost surely, 2^73157731 is an apocalyptic number.

73157731 is a deficient number, since it is larger than the sum of its proper divisors (1).

73157731 is an equidigital number, since it uses as much as digits as its factorization.

73157731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15435, while the sum is 34.

The square root of 73157731 is about 8553.2292732044. The cubic root of 73157731 is about 418.2347128501.

The spelling of 73157731 in words is "seventy-three million, one hundred fifty-seven thousand, seven hundred thirty-one".