87937891 has 2 divisors, whose sum is σ = 87937892. Its totient is φ = 87937890.

The previous prime is 87937877. The next prime is 87937921. The reversal of 87937891 is 19873978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87937891 - 2²¹ = 85840739 is a prime.

It is not a weakly prime, because it can be changed into another prime (82937891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43968945 + 43968946.

It is an arithmetic number, because the mean of its divisors is an integer number (43968946).

Almost surely, 2^87937891 is an apocalyptic number.

87937891 is a deficient number, since it is larger than the sum of its proper divisors (1).

87937891 is an equidigital number, since it uses as much as digits as its factorization.

87937891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 52.

The square root of 87937891 is about 9377.5205145070. The cubic root of 87937891 is about 444.6913501679.

The spelling of 87937891 in words is "eighty-seven million, nine hundred thirty-seven thousand, eight hundred ninety-one".