91581377 has 8 divisors (see below), whose sum is σ = 95676864. Its totient is φ = 87495408.

The previous prime is 91581367. The next prime is 91581433. The reversal of 91581377 is 77318519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91581377 - 2⁴ = 91581361 is a prime.

It is a super-2 number, since 2×91581377² = 16774297226432258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91581307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23318 + ... + 26960.

It is an arithmetic number, because the mean of its divisors is an integer number (11959608).

Almost surely, 2^91581377 is an apocalyptic number.

It is an amenable number.

91581377 is a deficient number, since it is larger than the sum of its proper divisors (4095487).

91581377 is a wasteful number, since it uses less digits than its factorization.

91581377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759.

The product of its digits is 52920, while the sum is 41.

The square root of 91581377 is about 9569.8159334441. The cubic root of 91581377 is about 450.7499872083.

The spelling of 91581377 in words is "ninety-one million, five hundred eighty-one thousand, three hundred seventy-seven".