87037991 has 2 divisors, whose sum is σ = 87037992. Its totient is φ = 87037990.

The previous prime is 87037969. The next prime is 87038041. The reversal of 87037991 is 19973078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87037991 - 2¹⁴ = 87021607 is a prime.

It is a super-2 number, since 2×87037991² = 15151223754632162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87037931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43518995 + 43518996.

It is an arithmetic number, because the mean of its divisors is an integer number (43518996).

Almost surely, 2^87037991 is an apocalyptic number.

87037991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87037991 is an equidigital number, since it uses as much as digits as its factorization.

87037991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 87037991 is about 9329.4153621757. The cubic root of 87037991 is about 443.1692508409.

The spelling of 87037991 in words is "eighty-seven million, thirty-seven thousand, nine hundred ninety-one".