47821931 has 2 divisors, whose sum is σ = 47821932. Its totient is φ = 47821930.

The previous prime is 47821909. The next prime is 47821937. The reversal of 47821931 is 13912874.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47821931 is a prime.

It is a super-2 number, since 2×47821931² = 4573874169137522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 47821891 and 47821900.

It is not a weakly prime, because it can be changed into another prime (47821937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23910965 + 23910966.

It is an arithmetic number, because the mean of its divisors is an integer number (23910966).

Almost surely, 2^47821931 is an apocalyptic number.

47821931 is a deficient number, since it is larger than the sum of its proper divisors (1).

47821931 is an equidigital number, since it uses as much as digits as its factorization.

47821931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 47821931 is about 6915.3402663933. The cubic root of 47821931 is about 362.9741549545.

The spelling of 47821931 in words is "forty-seven million, eight hundred twenty-one thousand, nine hundred thirty-one".