1205425553 has 4 divisors (see below), whose sum is σ = 1238004660. Its totient is φ = 1172846448.

The previous prime is 1205425457. The next prime is 1205425589. The reversal of 1205425553 is 3555245021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3555245021 = 19 ⋅187118159.

It can be written as a sum of positive squares in 2 ways, for example, as 849839104 + 355586449 = 29152^2 + 18857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205425553 - 2¹⁴ = 1205409169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205425153) 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, 16289498 + ... + 16289571.

It is an arithmetic number, because the mean of its divisors is an integer number (309501165).

Almost surely, 2^1205425553 is an apocalyptic number.

It is an amenable number.

1205425553 is a deficient number, since it is larger than the sum of its proper divisors (32579107).

1205425553 is an equidigital number, since it uses as much as digits as its factorization.

1205425553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32579106.

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 1205425553 is about 34719.2389461520. The cubic root of 1205425553 is about 1064.2576922267.

The spelling of 1205425553 in words is "one billion, two hundred five million, four hundred twenty-five thousand, five hundred fifty-three".