102971981 has 12 divisors (see below), whose sum is σ = 120734208. Its totient is φ = 87561432.

The previous prime is 102971977. The next prime is 102971983. The reversal of 102971981 is 189179201.

It is not a de Polignac number, because 102971981 - 2² = 102971977 is a prime.

It is a super-2 number, since 2×102971981² = 21206457742128722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102971983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2051 + ... + 14496.

It is an arithmetic number, because the mean of its divisors is an integer number (10061184).

Almost surely, 2^102971981 is an apocalyptic number.

It is an amenable number.

102971981 is a deficient number, since it is larger than the sum of its proper divisors (17762227).

102971981 is a wasteful number, since it uses less digits than its factorization.

102971981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16688 (or 16681 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 102971981 is about 10147.5110741502. The cubic root of 102971981 is about 468.7123059230.

The spelling of 102971981 in words is "one hundred two million, nine hundred seventy-one thousand, nine hundred eighty-one".