1540125413 has 4 divisors (see below), whose sum is σ = 1540207200. Its totient is φ = 1540043628.

The previous prime is 1540125361. The next prime is 1540125451. The reversal of 1540125413 is 3145210451.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3145210451 = 5281 ⋅595571.

It is a cyclic number.

It is not a de Polignac number, because 1540125413 - 2⁸ = 1540125157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540725413) 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, 3206 + ... + 55592.

It is an arithmetic number, because the mean of its divisors is an integer number (385051800).

Almost surely, 2^1540125413 is an apocalyptic number.

It is an amenable number.

1540125413 is a deficient number, since it is larger than the sum of its proper divisors (81787).

1540125413 is an equidigital number, since it uses as much as digits as its factorization.

1540125413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81786.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1540125413 is about 39244.4316177467. The cubic root of 1540125413 is about 1154.8316972710.

Adding to 1540125413 its reverse (3145210451), we get a palindrome (4685335864).

The spelling of 1540125413 in words is "one billion, five hundred forty million, one hundred twenty-five thousand, four hundred thirteen".