87442291 has 2 divisors, whose sum is σ = 87442292. Its totient is φ = 87442290.

The previous prime is 87442273. The next prime is 87442309. The reversal of 87442291 is 19224478.

It is a balanced prime because it is at equal distance from previous prime (87442273) and next prime (87442309).

It is a cyclic number.

It is not a de Polignac number, because 87442291 - 2¹⁷ = 87311219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87442291.

It is not a weakly prime, because it can be changed into another prime (87442261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43721145 + 43721146.

It is an arithmetic number, because the mean of its divisors is an integer number (43721146).

Almost surely, 2^87442291 is an apocalyptic number.

87442291 is a deficient number, since it is larger than the sum of its proper divisors (1).

87442291 is an equidigital number, since it uses as much as digits as its factorization.

87442291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 87442291 is about 9351.0582823550. The cubic root of 87442291 is about 443.8543793075.

The spelling of 87442291 in words is "eighty-seven million, four hundred forty-two thousand, two hundred ninety-one".