91455861 has 16 divisors (see below), whose sum is σ = 140137088. Its totient is φ = 51969600.

The previous prime is 91455853. The next prime is 91455907. The reversal of 91455861 is 16855419.

It is not a de Polignac number, because 91455861 - 2³ = 91455853 is a prime.

It is a super-2 number, since 2×91455861² = 16728349022502642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91455811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8230 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (8758568).

Almost surely, 2^91455861 is an apocalyptic number.

It is an amenable number.

91455861 is a deficient number, since it is larger than the sum of its proper divisors (48681227).

91455861 is a wasteful number, since it uses less digits than its factorization.

91455861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24252.

The product of its digits is 43200, while the sum is 39.

The square root of 91455861 is about 9563.2557740552. The cubic root of 91455861 is about 450.5439693341.

The spelling of 91455861 in words is "ninety-one million, four hundred fifty-five thousand, eight hundred sixty-one".