102986991 has 32 divisors (see below), whose sum is σ = 159805440. Its totient is φ = 65469600.

The previous prime is 102986941. The next prime is 102987029. The reversal of 102986991 is 199689201.

It is not a de Polignac number, because 102986991 - 2¹⁴ = 102970607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102986911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58561 + ... + 60293.

It is an arithmetic number, because the mean of its divisors is an integer number (4993920).

Almost surely, 2^102986991 is an apocalyptic number.

102986991 is a deficient number, since it is larger than the sum of its proper divisors (56818449).

102986991 is a wasteful number, since it uses less digits than its factorization.

102986991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 102986991 is about 10148.2506374252. The cubic root of 102986991 is about 468.7350792051.

The spelling of 102986991 in words is "one hundred two million, nine hundred eighty-six thousand, nine hundred ninety-one".