91431044 has 6 divisors (see below), whose sum is σ = 160004334. Its totient is φ = 45715520.

The previous prime is 91431037. The next prime is 91431079. The reversal of 91431044 is 44013419.

It can be written as a sum of positive squares in only one way, i.e., 53114944 + 38316100 = 7288^2 + 6190^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11428877 + ... + 11428884.

It is an arithmetic number, because the mean of its divisors is an integer number (26667389).

Almost surely, 2^91431044 is an apocalyptic number.

It is an amenable number.

91431044 is a deficient number, since it is larger than the sum of its proper divisors (68573290).

91431044 is a wasteful number, since it uses less digits than its factorization.

91431044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22857765 (or 22857763 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 91431044 is about 9561.9581676558. The cubic root of 91431044 is about 450.5032132030.

The spelling of 91431044 in words is "ninety-one million, four hundred thirty-one thousand, forty-four".