1540648523 has 4 divisors (see below), whose sum is σ = 1544671488. Its totient is φ = 1536625560.

The previous prime is 1540648517. The next prime is 1540648541. The reversal of 1540648523 is 3258460451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3258460451 = 31607 ⋅103093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540648523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540648723) 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, 2010908 + ... + 2011673.

It is an arithmetic number, because the mean of its divisors is an integer number (386167872).

Almost surely, 2^1540648523 is an apocalyptic number.

1540648523 is a deficient number, since it is larger than the sum of its proper divisors (4022965).

1540648523 is an equidigital number, since it uses as much as digits as its factorization.

1540648523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022964.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 1540648523 is about 39251.0958190978. The cubic root of 1540648523 is about 1154.9624302666.

The spelling of 1540648523 in words is "one billion, five hundred forty million, six hundred forty-eight thousand, five hundred twenty-three".