1240142513 has 4 divisors (see below), whose sum is σ = 1240327680. Its totient is φ = 1239957348.

The previous prime is 1240142479. The next prime is 1240142531. The reversal of 1240142513 is 3152410421.

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 an emirpimes, since its reverse is a distinct semiprime: 3152410421 = 5381 ⋅585841.

It is a cyclic number.

It is not a de Polignac number, because 1240142513 - 2¹⁰ = 1240141489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240142593) 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, 82145 + ... + 96062.

It is an arithmetic number, because the mean of its divisors is an integer number (310081920).

Almost surely, 2^1240142513 is an apocalyptic number.

It is an amenable number.

1240142513 is a deficient number, since it is larger than the sum of its proper divisors (185167).

1240142513 is an equidigital number, since it uses as much as digits as its factorization.

1240142513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185166.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1240142513 is about 35215.6572138019. The cubic root of 1240142513 is about 1074.3782272077.

Adding to 1240142513 its reverse (3152410421), we get a palindrome (4392552934).

The spelling of 1240142513 in words is "one billion, two hundred forty million, one hundred forty-two thousand, five hundred thirteen".