91982357489 has 4 divisors (see below), whose sum is σ = 100344390000. Its totient is φ = 83620324980.

The previous prime is 91982357483. The next prime is 91982357503. The reversal of 91982357489 is 98475328919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91982357489 - 2¹⁶ = 91982291953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91982357483) 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, 4181016239 + ... + 4181016260.

It is an arithmetic number, because the mean of its divisors is an integer number (25086097500).

Almost surely, 2^91982357489 is an apocalyptic number.

It is an amenable number.

91982357489 is a deficient number, since it is larger than the sum of its proper divisors (8362032511).

91982357489 is a wasteful number, since it uses less digits than its factorization.

91982357489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362032510.

The product of its digits is 39191040, while the sum is 65.

The spelling of 91982357489 in words is "ninety-one billion, nine hundred eighty-two million, three hundred fifty-seven thousand, four hundred eighty-nine".