455955991 has 4 divisors (see below), whose sum is σ = 456510832. Its totient is φ = 455401152.

The previous prime is 455955949. The next prime is 455956013. The reversal of 455955991 is 199559554.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199559554 = 2 ⋅99779777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-455955991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455955911) 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, 276186 + ... + 277831.

It is an arithmetic number, because the mean of its divisors is an integer number (114127708).

Almost surely, 2^455955991 is an apocalyptic number.

455955991 is a deficient number, since it is larger than the sum of its proper divisors (554841).

455955991 is an equidigital number, since it uses as much as digits as its factorization.

455955991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554840.

The product of its digits is 1822500, while the sum is 52.

The square root of 455955991 is about 21353.1260240743. The cubic root of 455955991 is about 769.6754639549.

The spelling of 455955991 in words is "four hundred fifty-five million, nine hundred fifty-five thousand, nine hundred ninety-one".