102631981 has 8 divisors (see below), whose sum is σ = 104948480. Its totient is φ = 100341072.

The previous prime is 102631967. The next prime is 102631993. The reversal of 102631981 is 189136201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102631981 - 2⁷ = 102631853 is a prime.

It is a super-5 number, since 5×102631981⁵ (a number of 41 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102631961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1831 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (13118560).

Almost surely, 2^102631981 is an apocalyptic number.

It is an amenable number.

102631981 is a deficient number, since it is larger than the sum of its proper divisors (2316499).

102631981 is a wasteful number, since it uses less digits than its factorization.

102631981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12795.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 102631981 is about 10130.7443458020. The cubic root of 102631981 is about 468.1958615382.

The spelling of 102631981 in words is "one hundred two million, six hundred thirty-one thousand, nine hundred eighty-one".