87247931 has 2 divisors, whose sum is σ = 87247932. Its totient is φ = 87247930.

The previous prime is 87247913. The next prime is 87247949. The reversal of 87247931 is 13974278.

Together with previous prime (87247913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (87247913) and next prime (87247949).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87247931 is a prime.

It is a super-2 number, since 2×87247931² = 15224402927561522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87247231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43623965 + 43623966.

It is an arithmetic number, because the mean of its divisors is an integer number (43623966).

Almost surely, 2^87247931 is an apocalyptic number.

87247931 is a deficient number, since it is larger than the sum of its proper divisors (1).

87247931 is an equidigital number, since it uses as much as digits as its factorization.

87247931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 87247931 is about 9340.6600944473. The cubic root of 87247931 is about 443.5252802278.

The spelling of 87247931 in words is "eighty-seven million, two hundred forty-seven thousand, nine hundred thirty-one".