87732991 has 2 divisors, whose sum is σ = 87732992. Its totient is φ = 87732990.

The previous prime is 87732979. The next prime is 87733001. The reversal of 87732991 is 19923778.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87732991 - 2²³ = 79344383 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 (87732191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43866495 + 43866496.

It is an arithmetic number, because the mean of its divisors is an integer number (43866496).

Almost surely, 2^87732991 is an apocalyptic number.

87732991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87732991 is an equidigital number, since it uses as much as digits as its factorization.

87732991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 87732991 is about 9366.5890803430. The cubic root of 87732991 is about 444.3456966704.

The spelling of 87732991 in words is "eighty-seven million, seven hundred thirty-two thousand, nine hundred ninety-one".