7981001887 has 2 divisors, whose sum is σ = 7981001888. Its totient is φ = 7981001886.

The previous prime is 7981001881. The next prime is 7981001923. The reversal of 7981001887 is 7881001897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7981001887 - 2⁷ = 7981001759 is a prime.

It is a super-2 number, since 2×7981001887² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7981001887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981001881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990500943 + 3990500944.

It is an arithmetic number, because the mean of its divisors is an integer number (3990500944).

Almost surely, 2^7981001887 is an apocalyptic number.

7981001887 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981001887 is an equidigital number, since it uses as much as digits as its factorization.

7981001887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 49.

The square root of 7981001887 is about 89336.4532931546. The cubic root of 7981001887 is about 1998.4155690374.

The spelling of 7981001887 in words is "seven billion, nine hundred eighty-one million, one thousand, eight hundred eighty-seven".