87931477 has 2 divisors, whose sum is σ = 87931478. Its totient is φ = 87931476.

The previous prime is 87931471. The next prime is 87931483. The reversal of 87931477 is 77413978.

It is a balanced prime because it is at equal distance from previous prime (87931471) and next prime (87931483).

It can be written as a sum of positive squares in only one way, i.e., 70408881 + 17522596 = 8391^2 + 4186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87931477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87931471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43965738 + 43965739.

It is an arithmetic number, because the mean of its divisors is an integer number (43965739).

Almost surely, 2^87931477 is an apocalyptic number.

It is an amenable number.

87931477 is a deficient number, since it is larger than the sum of its proper divisors (1).

87931477 is an equidigital number, since it uses as much as digits as its factorization.

87931477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 87931477 is about 9377.1785202160. The cubic root of 87931477 is about 444.6805382959.

The spelling of 87931477 in words is "eighty-seven million, nine hundred thirty-one thousand, four hundred seventy-seven".