91880147 has 4 divisors (see below), whose sum is σ = 95874960. Its totient is φ = 87885336.

The previous prime is 91880141. The next prime is 91880179. The reversal of 91880147 is 74108819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74108819 = 6073 ⋅12203.

It is a cyclic number.

It is not a de Polignac number, because 91880147 - 2⁶ = 91880083 is a prime.

It is a super-2 number, since 2×91880147² = 16883922825483218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91880147.

It is not an unprimeable number, because it can be changed into a prime (91880141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997372 + ... + 1997417.

It is an arithmetic number, because the mean of its divisors is an integer number (23968740).

Almost surely, 2^91880147 is an apocalyptic number.

91880147 is a deficient number, since it is larger than the sum of its proper divisors (3994813).

91880147 is a wasteful number, since it uses less digits than its factorization.

91880147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994812.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 91880147 is about 9585.4132409615. The cubic root of 91880147 is about 451.2396223855.

The spelling of 91880147 in words is "ninety-one million, eight hundred eighty thousand, one hundred forty-seven".