101660491 has 2 divisors, whose sum is σ = 101660492. Its totient is φ = 101660490.

The previous prime is 101660479. The next prime is 101660513. The reversal of 101660491 is 194066101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101660491 - 2¹¹ = 101658443 is a prime.

It is a super-2 number, since 2×101660491² = 20669710860722162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101660411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50830245 + 50830246.

It is an arithmetic number, because the mean of its divisors is an integer number (50830246).

Almost surely, 2^101660491 is an apocalyptic number.

101660491 is a deficient number, since it is larger than the sum of its proper divisors (1).

101660491 is an equidigital number, since it uses as much as digits as its factorization.

101660491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 101660491 is about 10082.6827283219. The cubic root of 101660491 is about 466.7138986775.

The spelling of 101660491 in words is "one hundred one million, six hundred sixty thousand, four hundred ninety-one".