47471981 has 2 divisors, whose sum is σ = 47471982. Its totient is φ = 47471980.

The previous prime is 47471959. The next prime is 47471987. The reversal of 47471981 is 18917474.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 21114025 = 5134^2 + 4595^2 .

It is a cyclic number.

It is not a de Polignac number, because 47471981 - 2²² = 43277677 is a prime.

It is a super-2 number, since 2×47471981² = 4507177960128722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47471987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23735990 + 23735991.

It is an arithmetic number, because the mean of its divisors is an integer number (23735991).

Almost surely, 2^47471981 is an apocalyptic number.

It is an amenable number.

47471981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47471981 is an equidigital number, since it uses as much as digits as its factorization.

47471981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 47471981 is about 6889.9913642907. The cubic root of 47471981 is about 362.0865990431.

The spelling of 47471981 in words is "forty-seven million, four hundred seventy-one thousand, nine hundred eighty-one".