240115251 has 4 divisors (see below), whose sum is σ = 320153672. Its totient is φ = 160076832.

The previous prime is 240115241. The next prime is 240115261. The reversal of 240115251 is 152511042.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (240115241) and next prime (240115261).

It is a de Polignac number, because none of the positive numbers 2^k-240115251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240115201) 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, 40019206 + ... + 40019211.

It is an arithmetic number, because the mean of its divisors is an integer number (80038418).

Almost surely, 2^240115251 is an apocalyptic number.

240115251 is a deficient number, since it is larger than the sum of its proper divisors (80038421).

240115251 is an equidigital number, since it uses as much as digits as its factorization.

240115251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80038420.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 240115251 is about 15495.6526484043. The cubic root of 240115251 is about 621.5459607312.

Adding to 240115251 its reverse (152511042), we get a palindrome (392626293).

The spelling of 240115251 in words is "two hundred forty million, one hundred fifteen thousand, two hundred fifty-one".