1540501023 has 4 divisors (see below), whose sum is σ = 2054001368. Its totient is φ = 1027000680.

The previous prime is 1540501009. The next prime is 1540501037. The reversal of 1540501023 is 3201050451.

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

It is an interprime number because it is at equal distance from previous prime (1540501009) and next prime (1540501037).

It is not a de Polignac number, because 1540501023 - 2⁵ = 1540500991 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 (1540501003) 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, 256750168 + ... + 256750173.

It is an arithmetic number, because the mean of its divisors is an integer number (513500342).

Almost surely, 2^1540501023 is an apocalyptic number.

1540501023 is a deficient number, since it is larger than the sum of its proper divisors (513500345).

1540501023 is an equidigital number, since it uses as much as digits as its factorization.

1540501023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513500344.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1540501023 is about 39249.2168456901. The cubic root of 1540501023 is about 1154.9255708115.

Adding to 1540501023 its reverse (3201050451), we get a palindrome (4741551474).

The spelling of 1540501023 in words is "one billion, five hundred forty million, five hundred one thousand, twenty-three".