240591121 has 3 divisors (see below), whose sum is σ = 240606633. Its totient is φ = 240575610.

The previous prime is 240591107. The next prime is 240591151. The reversal of 240591121 is 121195042.

It is a happy number.

The square root of 240591121 is 15511.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 240591121 - 2¹¹ = 240589073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240591101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7756 + ... + 23266.

It is an arithmetic number, because the mean of its divisors is an integer number (80202211).

Almost surely, 2^240591121 is an apocalyptic number.

240591121 is the 15511-st square number.

240591121 is the 7756-th centered octagonal number.

It is an amenable number.

240591121 is a deficient number, since it is larger than the sum of its proper divisors (15512).

240591121 is an frugal number, since it uses more digits than its factorization.

240591121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31022 (or 15511 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The cubic root of 240591121 is about 621.9562913218.

Multiplying 240591121 by its sum of digits (25), we get a square (6014778025 = 77555²).

It can be divided in two parts, 240 and 591121, that added together give a square (591361 = 769²).

The spelling of 240591121 in words is "two hundred forty million, five hundred ninety-one thousand, one hundred twenty-one".