101042309 has 4 divisors (see below), whose sum is σ = 101445120. Its totient is φ = 100639500.

The previous prime is 101042287. The next prime is 101042311. The reversal of 101042309 is 903240101.

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 an emirpimes, since its reverse is a distinct semiprime: 903240101 = 79 ⋅11433419.

It is a cyclic number.

It is not a de Polignac number, because 101042309 - 2¹² = 101038213 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 (101042369) 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, 201029 + ... + 201530.

It is an arithmetic number, because the mean of its divisors is an integer number (25361280).

Almost surely, 2^101042309 is an apocalyptic number.

It is an amenable number.

101042309 is a deficient number, since it is larger than the sum of its proper divisors (402811).

101042309 is an equidigital number, since it uses as much as digits as its factorization.

101042309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402810.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 101042309 is about 10051.9803521495. The cubic root of 101042309 is about 465.7659692323.

The spelling of 101042309 in words is "one hundred one million, forty-two thousand, three hundred nine".