45631978291 has 4 divisors (see below), whose sum is σ = 45719564184. Its totient is φ = 45544392400.

The previous prime is 45631978279. The next prime is 45631978333. The reversal of 45631978291 is 19287913654.

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: 19287913654 = 2 ⋅9643956827.

It is a cyclic number.

It is not a de Polignac number, because 45631978291 - 2¹³ = 45631970099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45631978241) 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, 43792165 + ... + 43793206.

It is an arithmetic number, because the mean of its divisors is an integer number (11429891046).

Almost surely, 2^45631978291 is an apocalyptic number.

45631978291 is a deficient number, since it is larger than the sum of its proper divisors (87585893).

45631978291 is an equidigital number, since it uses as much as digits as its factorization.

45631978291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87585892.

The product of its digits is 3265920, while the sum is 55.

The spelling of 45631978291 in words is "forty-five billion, six hundred thirty-one million, nine hundred seventy-eight thousand, two hundred ninety-one".