1540445231 has 4 divisors (see below), whose sum is σ = 1658941032. Its totient is φ = 1421949432.

The previous prime is 1540445213. The next prime is 1540445251. The reversal of 1540445231 is 1325440451.

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 1540445231 - 2¹⁸ = 1540183087 is a prime.

It is a super-2 number, since 2×1540445231² = 4745943019421286722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1540445194 and 1540445203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540445251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59247881 + ... + 59247906.

It is an arithmetic number, because the mean of its divisors is an integer number (414735258).

Almost surely, 2^1540445231 is an apocalyptic number.

1540445231 is a deficient number, since it is larger than the sum of its proper divisors (118495801).

1540445231 is a wasteful number, since it uses less digits than its factorization.

1540445231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118495800.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1540445231 is about 39248.5060989587. The cubic root of 1540445231 is about 1154.9116280780.

Adding to 1540445231 its reverse (1325440451), we get a palindrome (2865885682).

The spelling of 1540445231 in words is "one billion, five hundred forty million, four hundred forty-five thousand, two hundred thirty-one".