1540520053 has 4 divisors (see below), whose sum is σ = 1542663360. Its totient is φ = 1538376748.

The previous prime is 1540520041. The next prime is 1540520083. The reversal of 1540520053 is 3500250451.

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 an emirpimes, since its reverse is a distinct semiprime: 3500250451 = 521 ⋅6718331.

It is a cyclic number.

It is not a de Polignac number, because 1540520053 - 2²¹ = 1538422901 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 (1540520083) 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, 1070575 + ... + 1072012.

It is an arithmetic number, because the mean of its divisors is an integer number (385665840).

Almost surely, 2^1540520053 is an apocalyptic number.

It is an amenable number.

1540520053 is a deficient number, since it is larger than the sum of its proper divisors (2143307).

1540520053 is an equidigital number, since it uses as much as digits as its factorization.

1540520053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143306.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1540520053 is about 39249.4592701607. The cubic root of 1540520053 is about 1154.9303264381.

The spelling of 1540520053 in words is "one billion, five hundred forty million, five hundred twenty thousand, fifty-three".