91261554 has 32 divisors (see below), whose sum is σ = 188282880. Its totient is φ = 29475600.

The previous prime is 91261553. The next prime is 91261561. The reversal of 91261554 is 45516219.

It is not an unprimeable number, because it can be changed into a prime (91261553) 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, 23319 + ... + 26949.

It is an arithmetic number, because the mean of its divisors is an integer number (5883840).

Almost surely, 2^91261554 is an apocalyptic number.

91261554 is an abundant number, since it is smaller than the sum of its proper divisors (97021326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91261554 is a wasteful number, since it uses less digits than its factorization.

91261554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766.

The product of its digits is 10800, while the sum is 33.

The square root of 91261554 is about 9553.0913321291. The cubic root of 91261554 is about 450.2246680599.

The spelling of 91261554 in words is "ninety-one million, two hundred sixty-one thousand, five hundred fifty-four".