101662409 has 2 divisors, whose sum is σ = 101662410. Its totient is φ = 101662408.

The previous prime is 101662403. The next prime is 101662433. The reversal of 101662409 is 904266101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100902025 + 760384 = 10045^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 101662409 - 2⁸ = 101662153 is a prime.

It is not a weakly prime, because it can be changed into another prime (101662403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50831204 + 50831205.

It is an arithmetic number, because the mean of its divisors is an integer number (50831205).

Almost surely, 2^101662409 is an apocalyptic number.

It is an amenable number.

101662409 is a deficient number, since it is larger than the sum of its proper divisors (1).

101662409 is an equidigital number, since it uses as much as digits as its factorization.

101662409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 101662409 is about 10082.7778414483. Note that the first 3 decimals coincide. The cubic root of 101662409 is about 466.7168337791.

The spelling of 101662409 in words is "one hundred one million, six hundred sixty-two thousand, four hundred nine".