91897755 has 16 divisors (see below), whose sum is σ = 147386400. Its totient is φ = 48895488.

The previous prime is 91897753. The next prime is 91897787. The reversal of 91897755 is 55779819.

It is not a de Polignac number, because 91897755 - 2¹ = 91897753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91897698 and 91897707.

It is not an unprimeable number, because it can be changed into a prime (91897753) 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, 580 + ... + 13569.

It is an arithmetic number, because the mean of its divisors is an integer number (9211650).

Almost surely, 2^91897755 is an apocalyptic number.

91897755 is a deficient number, since it is larger than the sum of its proper divisors (55488645).

91897755 is a wasteful number, since it uses less digits than its factorization.

91897755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14590.

The product of its digits is 793800, while the sum is 51.

The square root of 91897755 is about 9586.3316758810. The cubic root of 91897755 is about 451.2684458765.

The spelling of 91897755 in words is "ninety-one million, eight hundred ninety-seven thousand, seven hundred fifty-five".