240690161 has 4 divisors (see below), whose sum is σ = 240802800. Its totient is φ = 240577524.

The previous prime is 240690139. The next prime is 240690173. The reversal of 240690161 is 161096042.

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.

It is a cyclic number.

It is not a de Polignac number, because 240690161 - 2¹⁸ = 240428017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240690181) 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, 53051 + ... + 57408.

It is an arithmetic number, because the mean of its divisors is an integer number (60200700).

Almost surely, 2^240690161 is an apocalyptic number.

It is an amenable number.

240690161 is a deficient number, since it is larger than the sum of its proper divisors (112639).

240690161 is a wasteful number, since it uses less digits than its factorization.

240690161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112638.

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

The square root of 240690161 is about 15514.1922445224. The cubic root of 240690161 is about 622.0416229560.

The spelling of 240690161 in words is "two hundred forty million, six hundred ninety thousand, one hundred sixty-one".