91874873 has 2 divisors, whose sum is σ = 91874874. Its totient is φ = 91874872.

The previous prime is 91874869. The next prime is 91874879. The reversal of 91874873 is 37847819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77228944 + 14645929 = 8788^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 91874873 - 2² = 91874869 is a prime.

It is a super-2 number, since 2×91874873² = 16881984577532258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91874879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45937436 + 45937437.

It is an arithmetic number, because the mean of its divisors is an integer number (45937437).

Almost surely, 2^91874873 is an apocalyptic number.

It is an amenable number.

91874873 is a deficient number, since it is larger than the sum of its proper divisors (1).

91874873 is an equidigital number, since it uses as much as digits as its factorization.

91874873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 91874873 is about 9585.1381315034. The cubic root of 91874873 is about 451.2309883719.

The spelling of 91874873 in words is "ninety-one million, eight hundred seventy-four thousand, eight hundred seventy-three".