47881831 has 2 divisors, whose sum is σ = 47881832. Its totient is φ = 47881830.

The previous prime is 47881817. The next prime is 47881849. The reversal of 47881831 is 13818874.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47881831 - 2¹⁵ = 47849063 is a prime.

It is a super-2 number, since 2×47881831² = 4585339479825122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47881531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23940915 + 23940916.

It is an arithmetic number, because the mean of its divisors is an integer number (23940916).

Almost surely, 2^47881831 is an apocalyptic number.

47881831 is a deficient number, since it is larger than the sum of its proper divisors (1).

47881831 is an equidigital number, since it uses as much as digits as its factorization.

47881831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 47881831 is about 6919.6698620671. The cubic root of 47881831 is about 363.1256411027.

The spelling of 47881831 in words is "forty-seven million, eight hundred eighty-one thousand, eight hundred thirty-one".