91997552 has 10 divisors (see below), whose sum is σ = 178245288. Its totient is φ = 45998768.

The previous prime is 91997551. The next prime is 91997561. The reversal of 91997552 is 25579919.

It is a junction number, because it is equal to n+sod(n) for n = 91997497 and 91997506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91997551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2874908 + ... + 2874939.

Almost surely, 2^91997552 is an apocalyptic number.

It is an amenable number.

91997552 is a deficient number, since it is larger than the sum of its proper divisors (86247736).

91997552 is a wasteful number, since it uses less digits than its factorization.

91997552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749855 (or 5749849 counting only the distinct ones).

The product of its digits is 255150, while the sum is 47.

The square root of 91997552 is about 9591.5354349551. The cubic root of 91997552 is about 451.4317394731.

The spelling of 91997552 in words is "ninety-one million, nine hundred ninety-seven thousand, five hundred fifty-two".