87433691 has 2 divisors, whose sum is σ = 87433692. Its totient is φ = 87433690.

The previous prime is 87433667. The next prime is 87433739. The reversal of 87433691 is 19633478.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87433691 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87433651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43716845 + 43716846.

It is an arithmetic number, because the mean of its divisors is an integer number (43716846).

Almost surely, 2^87433691 is an apocalyptic number.

87433691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87433691 is an equidigital number, since it uses as much as digits as its factorization.

87433691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 87433691 is about 9350.5984300471. The cubic root of 87433691 is about 443.8398277187.

The spelling of 87433691 in words is "eighty-seven million, four hundred thirty-three thousand, six hundred ninety-one".