1240515161 has 4 divisors (see below), whose sum is σ = 1240841472. Its totient is φ = 1240188852.

The previous prime is 1240515151. The next prime is 1240515193. The reversal of 1240515161 is 1615150421.

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 1240515161 - 2¹⁰ = 1240514137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240515161.

It is not an unprimeable number, because it can be changed into a prime (1240515151) 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, 157385 + ... + 165078.

It is an arithmetic number, because the mean of its divisors is an integer number (310210368).

Almost surely, 2^1240515161 is an apocalyptic number.

It is an amenable number.

1240515161 is a deficient number, since it is larger than the sum of its proper divisors (326311).

1240515161 is an equidigital number, since it uses as much as digits as its factorization.

1240515161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326310.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1240515161 is about 35220.9477584008. The cubic root of 1240515161 is about 1074.4858290354.

Adding to 1240515161 its reverse (1615150421), we get a palindrome (2855665582).

The spelling of 1240515161 in words is "one billion, two hundred forty million, five hundred fifteen thousand, one hundred sixty-one".