1540131403 has 4 divisors (see below), whose sum is σ = 1541225880. Its totient is φ = 1539036928.

The previous prime is 1540131379. The next prime is 1540131407. The reversal of 1540131403 is 3041310451.

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

It is a cyclic number.

It is not a de Polignac number, because 1540131403 - 2²⁵ = 1506576971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540131407) 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, 545125 + ... + 547942.

It is an arithmetic number, because the mean of its divisors is an integer number (385306470).

Almost surely, 2^1540131403 is an apocalyptic number.

1540131403 is a deficient number, since it is larger than the sum of its proper divisors (1094477).

1540131403 is a wasteful number, since it uses less digits than its factorization.

1540131403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094476.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1540131403 is about 39244.5079342320. The cubic root of 1540131403 is about 1154.8331944289.

Adding to 1540131403 its reverse (3041310451), we get a palindrome (4581441854).

The spelling of 1540131403 in words is "one billion, five hundred forty million, one hundred thirty-one thousand, four hundred three".