91921763 has 4 divisors (see below), whose sum is σ = 92021640. Its totient is φ = 91821888.

The previous prime is 91921757. The next prime is 91921799. The reversal of 91921763 is 36712919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36712919 = 1301 ⋅28219.

It is a cyclic number.

It is not a de Polignac number, because 91921763 - 2⁶ = 91921699 is a prime.

It is a super-2 number, since 2×91921763² = 16899221026056338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91921733) 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, 48545 + ... + 50402.

It is an arithmetic number, because the mean of its divisors is an integer number (23005410).

Almost surely, 2^91921763 is an apocalyptic number.

91921763 is a deficient number, since it is larger than the sum of its proper divisors (99877).

91921763 is an equidigital number, since it uses as much as digits as its factorization.

91921763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99876.

The product of its digits is 20412, while the sum is 38.

The square root of 91921763 is about 9587.5837936364. The cubic root of 91921763 is about 451.3077399431.

The spelling of 91921763 in words is "ninety-one million, nine hundred twenty-one thousand, seven hundred sixty-three".