1553515253 has 4 divisors (see below), whose sum is σ = 1579846080. Its totient is φ = 1527184428.

The previous prime is 1553515247. The next prime is 1553515283. The reversal of 1553515253 is 3525153551.

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: 3525153551 = 29 ⋅121557019.

It is a cyclic number.

It is not a de Polignac number, because 1553515253 - 2¹⁶ = 1553449717 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 (1553515213) 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, 13165325 + ... + 13165442.

It is an arithmetic number, because the mean of its divisors is an integer number (394961520).

Almost surely, 2^1553515253 is an apocalyptic number.

It is an amenable number.

1553515253 is a deficient number, since it is larger than the sum of its proper divisors (26330827).

1553515253 is an equidigital number, since it uses as much as digits as its factorization.

1553515253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26330826.

The product of its digits is 56250, while the sum is 35.

The square root of 1553515253 is about 39414.6578445126. The cubic root of 1553515253 is about 1158.1687447920.

The spelling of 1553515253 in words is "one billion, five hundred fifty-three million, five hundred fifteen thousand, two hundred fifty-three".