101557979 has 2 divisors, whose sum is σ = 101557980. Its totient is φ = 101557978.

The previous prime is 101557969. The next prime is 101557993. The reversal of 101557979 is 979755101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101557979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101557909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50778989 + 50778990.

It is an arithmetic number, because the mean of its divisors is an integer number (50778990).

Almost surely, 2^101557979 is an apocalyptic number.

101557979 is a deficient number, since it is larger than the sum of its proper divisors (1).

101557979 is an equidigital number, since it uses as much as digits as its factorization.

101557979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99225, while the sum is 44.

The square root of 101557979 is about 10077.5978784629. The cubic root of 101557979 is about 466.5569715526.

The spelling of 101557979 in words is "one hundred one million, five hundred fifty-seven thousand, nine hundred seventy-nine".