101023123309 has 4 divisors (see below), whose sum is σ = 101023770240. Its totient is φ = 101022476380.

The previous prime is 101023123303. The next prime is 101023123319. The reversal of 101023123309 is 903321320101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101023123309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101023123303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71652 + ... + 455170.

It is an arithmetic number, because the mean of its divisors is an integer number (25255942560).

Almost surely, 2^101023123309 is an apocalyptic number.

It is an amenable number.

101023123309 is a deficient number, since it is larger than the sum of its proper divisors (646931).

101023123309 is an equidigital number, since it uses as much as digits as its factorization.

101023123309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646930.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 101023123309 in words is "one hundred one billion, twenty-three million, one hundred twenty-three thousand, three hundred nine".