49131531491 has 4 divisors (see below), whose sum is σ = 56150321712. Its totient is φ = 42112741272.

The previous prime is 49131531481. The next prime is 49131531521. The reversal of 49131531491 is 19413513194.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 49131531491 - 2¹⁸ = 49131269347 is a prime.

It is a super-2 number, since 2×49131531491² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49131531481) 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, 3509395100 + ... + 3509395113.

It is an arithmetic number, because the mean of its divisors is an integer number (14037580428).

Almost surely, 2^49131531491 is an apocalyptic number.

49131531491 is a deficient number, since it is larger than the sum of its proper divisors (7018790221).

49131531491 is an equidigital number, since it uses as much as digits as its factorization.

49131531491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7018790220.

The product of its digits is 58320, while the sum is 41.

The spelling of 49131531491 in words is "forty-nine billion, one hundred thirty-one million, five hundred thirty-one thousand, four hundred ninety-one".