101423209 has 2 divisors, whose sum is σ = 101423210. Its totient is φ = 101423208.

The previous prime is 101423191. The next prime is 101423219. The reversal of 101423209 is 902324101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 30913600 = 8397^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 101423209 - 2²¹ = 99326057 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101423209.

It is not a weakly prime, because it can be changed into another prime (101423219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50711604 + 50711605.

It is an arithmetic number, because the mean of its divisors is an integer number (50711605).

Almost surely, 2^101423209 is an apocalyptic number.

It is an amenable number.

101423209 is a deficient number, since it is larger than the sum of its proper divisors (1).

101423209 is an equidigital number, since it uses as much as digits as its factorization.

101423209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 101423209 is about 10070.9090453643. The cubic root of 101423209 is about 466.3505025723.

The spelling of 101423209 in words is "one hundred one million, four hundred twenty-three thousand, two hundred nine".