840157931 has 2 divisors, whose sum is σ = 840157932. Its totient is φ = 840157930.

The previous prime is 840157891. The next prime is 840157943. The reversal of 840157931 is 139751048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840157931 - 2¹⁰ = 840156907 is a prime.

It is a super-2 number, since 2×840157931² = 1411730698044401522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840157991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420078965 + 420078966.

It is an arithmetic number, because the mean of its divisors is an integer number (420078966).

Almost surely, 2^840157931 is an apocalyptic number.

840157931 is a deficient number, since it is larger than the sum of its proper divisors (1).

840157931 is an equidigital number, since it uses as much as digits as its factorization.

840157931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 840157931 is about 28985.4779329236. The cubic root of 840157931 is about 943.5979249076.

The spelling of 840157931 in words is "eight hundred forty million, one hundred fifty-seven thousand, nine hundred thirty-one".