87691418531 has 2 divisors, whose sum is σ = 87691418532. Its totient is φ = 87691418530.

The previous prime is 87691418497. The next prime is 87691418627. The reversal of 87691418531 is 13581419678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87691418531 - 2¹⁴ = 87691402147 is a prime.

It is a super-2 number, since 2×87691418531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87691415531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43845709265 + 43845709266.

It is an arithmetic number, because the mean of its divisors is an integer number (43845709266).

Almost surely, 2^87691418531 is an apocalyptic number.

87691418531 is a deficient number, since it is larger than the sum of its proper divisors (1).

87691418531 is an equidigital number, since it uses as much as digits as its factorization.

87691418531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The spelling of 87691418531 in words is "eighty-seven billion, six hundred ninety-one million, four hundred eighteen thousand, five hundred thirty-one".