97861831 has 2 divisors, whose sum is σ = 97861832. Its totient is φ = 97861830.

The previous prime is 97861817. The next prime is 97861853. The reversal of 97861831 is 13816879.

It is a weak prime.

It is an emirp because it is prime and its reverse (13816879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97861831 - 2⁹ = 97861319 is a prime.

It is a super-2 number, since 2×97861831² = 19153875933345122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97861811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48930915 + 48930916.

It is an arithmetic number, because the mean of its divisors is an integer number (48930916).

Almost surely, 2^97861831 is an apocalyptic number.

97861831 is a deficient number, since it is larger than the sum of its proper divisors (1).

97861831 is an equidigital number, since it uses as much as digits as its factorization.

97861831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 97861831 is about 9892.5138867732. The cubic root of 97861831 is about 460.8268540419.

The spelling of 97861831 in words is "ninety-seven million, eight hundred sixty-one thousand, eight hundred thirty-one".