47749931 has 4 divisors (see below), whose sum is σ = 47767992. Its totient is φ = 47731872.

The previous prime is 47749883. The next prime is 47749963. The reversal of 47749931 is 13994774.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 47749931 - 2²² = 43555627 is a prime.

It is a super-2 number, since 2×47749931² = 4560111821009522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47749981) 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, 4205 + ... + 10638.

It is an arithmetic number, because the mean of its divisors is an integer number (11941998).

Almost surely, 2^47749931 is an apocalyptic number.

47749931 is a deficient number, since it is larger than the sum of its proper divisors (18061).

47749931 is a wasteful number, since it uses less digits than its factorization.

47749931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060.

The product of its digits is 190512, while the sum is 44.

The square root of 47749931 is about 6910.1324878760. The cubic root of 47749931 is about 362.7919005974.

The spelling of 47749931 in words is "forty-seven million, seven hundred forty-nine thousand, nine hundred thirty-one".