101979 has 10 divisors (see below), whose sum is σ = 152460. Its totient is φ = 67932.

The previous prime is 101977. The next prime is 101987. The reversal of 101979 is 979101.

It is not a de Polignac number, because 101979 - 2¹ = 101977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (101977) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 549 + ... + 710.

It is an arithmetic number, because the mean of its divisors is an integer number (15246).

2¹⁰¹⁹⁷⁹ is an apocalyptic number.

101979 is a deficient number, since it is larger than the sum of its proper divisors (50481).

101979 is an equidigital number, since it uses as much as digits as its factorization.

101979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 101979 is about 319.3415099858. The cubic root of 101979 is about 46.7200805634.

The spelling of 101979 in words is "one hundred one thousand, nine hundred seventy-nine".