87471947 has 2 divisors, whose sum is σ = 87471948. Its totient is φ = 87471946.

The previous prime is 87471941. The next prime is 87471961. The reversal of 87471947 is 74917478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87471947 - 2⁴ = 87471931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87471941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43735973 + 43735974.

It is an arithmetic number, because the mean of its divisors is an integer number (43735974).

Almost surely, 2^87471947 is an apocalyptic number.

87471947 is a deficient number, since it is larger than the sum of its proper divisors (1).

87471947 is an equidigital number, since it uses as much as digits as its factorization.

87471947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 87471947 is about 9352.6438508050. The cubic root of 87471947 is about 443.9045512840.

The spelling of 87471947 in words is "eighty-seven million, four hundred seventy-one thousand, nine hundred forty-seven".