91551044 has 36 divisors (see below), whose sum is σ = 182134764. Its totient is φ = 40022208.

The previous prime is 91551041. The next prime is 91551049. The reversal of 91551044 is 44015519.

It can be written as a sum of positive squares in 2 ways, for example, as 19096900 + 72454144 = 4370^2 + 8512^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91550998 and 91551016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91551041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16334 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (5059299).

Almost surely, 2^91551044 is an apocalyptic number.

It is an amenable number.

91551044 is a deficient number, since it is larger than the sum of its proper divisors (90583720).

91551044 is a wasteful number, since it uses less digits than its factorization.

91551044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932 (or 4911 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 91551044 is about 9568.2309754729. The cubic root of 91551044 is about 450.7002168671.

The spelling of 91551044 in words is "ninety-one million, five hundred fifty-one thousand, forty-four".