102720979 has 2 divisors, whose sum is σ = 102720980. Its totient is φ = 102720978.

The previous prime is 102720977. The next prime is 102721007. The reversal of 102720979 is 979027201.

It is a weak prime.

It is an emirp because it is prime and its reverse (979027201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102720979 - 2¹ = 102720977 is a prime.

Together with 102720977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (102720977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51360489 + 51360490.

It is an arithmetic number, because the mean of its divisors is an integer number (51360490).

Almost surely, 2^102720979 is an apocalyptic number.

102720979 is a deficient number, since it is larger than the sum of its proper divisors (1).

102720979 is an equidigital number, since it uses as much as digits as its factorization.

102720979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 102720979 is about 10135.1358649009. The cubic root of 102720979 is about 468.3311554829.

The spelling of 102720979 in words is "one hundred two million, seven hundred twenty thousand, nine hundred seventy-nine".