87531331 has 2 divisors, whose sum is σ = 87531332. Its totient is φ = 87531330.

The previous prime is 87531329. The next prime is 87531337. The reversal of 87531331 is 13313578.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87531331 - 2¹ = 87531329 is a prime.

It is a super-2 number, since 2×87531331² = 15323467813263122, which contains 22 as substring.

Together with 87531329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 87531293 and 87531302.

It is not a weakly prime, because it can be changed into another prime (87531337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43765665 + 43765666.

It is an arithmetic number, because the mean of its divisors is an integer number (43765666).

Almost surely, 2^87531331 is an apocalyptic number.

87531331 is a deficient number, since it is larger than the sum of its proper divisors (1).

87531331 is an equidigital number, since it uses as much as digits as its factorization.

87531331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 87531331 is about 9355.8180294403. The cubic root of 87531331 is about 444.0049829676.

The spelling of 87531331 in words is "eighty-seven million, five hundred thirty-one thousand, three hundred thirty-one".