102141989 has 2 divisors, whose sum is σ = 102141990. Its totient is φ = 102141988.

The previous prime is 102141983. The next prime is 102141997. The reversal of 102141989 is 989141201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78180964 + 23961025 = 8842^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 102141989 - 2⁸ = 102141733 is a prime.

It is a super-2 number, since 2×102141989² = 20865971833752242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102141983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51070994 + 51070995.

It is an arithmetic number, because the mean of its divisors is an integer number (51070995).

Almost surely, 2^102141989 is an apocalyptic number.

It is an amenable number.

102141989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102141989 is an equidigital number, since it uses as much as digits as its factorization.

102141989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 102141989 is about 10106.5319966841. The cubic root of 102141989 is about 467.4495760003.

The spelling of 102141989 in words is "one hundred two million, one hundred forty-one thousand, nine hundred eighty-nine".