101981399879 has 2 divisors, whose sum is σ = 101981399880. Its totient is φ = 101981399878.

The previous prime is 101981399867. The next prime is 101981399911. The reversal of 101981399879 is 978993189101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101981399879 - 2²⁴ = 101964622663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101981309879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50990699939 + 50990699940.

It is an arithmetic number, because the mean of its divisors is an integer number (50990699940).

Almost surely, 2^101981399879 is an apocalyptic number.

101981399879 is a deficient number, since it is larger than the sum of its proper divisors (1).

101981399879 is an equidigital number, since it uses as much as digits as its factorization.

101981399879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 65.

The spelling of 101981399879 in words is "one hundred one billion, nine hundred eighty-one million, three hundred ninety-nine thousand, eight hundred seventy-nine".