91861051 has 2 divisors, whose sum is σ = 91861052. Its totient is φ = 91861050.

The previous prime is 91861043. The next prime is 91861061. The reversal of 91861051 is 15016819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91861051 - 2³ = 91861043 is a prime.

It is not a weakly prime, because it can be changed into another prime (91861061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45930525 + 45930526.

It is an arithmetic number, because the mean of its divisors is an integer number (45930526).

Almost surely, 2^91861051 is an apocalyptic number.

91861051 is a deficient number, since it is larger than the sum of its proper divisors (1).

91861051 is an equidigital number, since it uses as much as digits as its factorization.

91861051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 91861051 is about 9584.4170923432. The cubic root of 91861051 is about 451.2083589438.

The spelling of 91861051 in words is "ninety-one million, eight hundred sixty-one thousand, fifty-one".