91873357 has 2 divisors, whose sum is σ = 91873358. Its totient is φ = 91873356.

The previous prime is 91873291. The next prime is 91873387. The reversal of 91873357 is 75337819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91278916 + 594441 = 9554^2 + 771^2 .

It is a cyclic number.

It is not a de Polignac number, because 91873357 - 2²³ = 83484749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91873387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45936678 + 45936679.

It is an arithmetic number, because the mean of its divisors is an integer number (45936679).

Almost surely, 2^91873357 is an apocalyptic number.

It is an amenable number.

91873357 is a deficient number, since it is larger than the sum of its proper divisors (1).

91873357 is an equidigital number, since it uses as much as digits as its factorization.

91873357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 91873357 is about 9585.0590504180. The cubic root of 91873357 is about 451.2285064821.

It can be divided in two parts, 9187 and 3357, that added together give a square (12544 = 112²).

The spelling of 91873357 in words is "ninety-one million, eight hundred seventy-three thousand, three hundred fifty-seven".