240156109 has 4 divisors (see below), whose sum is σ = 240187104. Its totient is φ = 240125116.

The previous prime is 240156097. The next prime is 240156131. The reversal of 240156109 is 901651042.

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 not a de Polignac number, because 240156109 - 2¹⁵ = 240123341 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 (240136109) 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, 7704 + ... + 23230.

It is an arithmetic number, because the mean of its divisors is an integer number (60046776).

Almost surely, 2^240156109 is an apocalyptic number.

It is an amenable number.

240156109 is a deficient number, since it is larger than the sum of its proper divisors (30995).

240156109 is a wasteful number, since it uses less digits than its factorization.

240156109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30994.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 240156109 is about 15496.9709620945. The cubic root of 240156109 is about 621.5812128091.

The spelling of 240156109 in words is "two hundred forty million, one hundred fifty-six thousand, one hundred nine".