47881981531 has 4 divisors (see below), whose sum is σ = 48693540600. Its totient is φ = 47070422464.

The previous prime is 47881981513. The next prime is 47881981571. The reversal of 47881981531 is 13518918874.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47881981531 is a prime.

It is a super-2 number, since 2×47881981531² (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 (47881981571) 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, 405779446 + ... + 405779563.

It is an arithmetic number, because the mean of its divisors is an integer number (12173385150).

Almost surely, 2^47881981531 is an apocalyptic number.

47881981531 is a deficient number, since it is larger than the sum of its proper divisors (811559069).

47881981531 is an equidigital number, since it uses as much as digits as its factorization.

47881981531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811559068.

The product of its digits is 1935360, while the sum is 55.

The spelling of 47881981531 in words is "forty-seven billion, eight hundred eighty-one million, nine hundred eighty-one thousand, five hundred thirty-one".