1201425553 has 4 divisors (see below), whose sum is σ = 1240181248. Its totient is φ = 1162669860.

The previous prime is 1201425551. The next prime is 1201425559. The reversal of 1201425553 is 3555241021.

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: 3555241021 = 16319 ⋅217859.

It is a cyclic number.

It is not a de Polignac number, because 1201425553 - 2¹ = 1201425551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201425551) 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, 19377801 + ... + 19377862.

It is an arithmetic number, because the mean of its divisors is an integer number (310045312).

Almost surely, 2^1201425553 is an apocalyptic number.

It is an amenable number.

1201425553 is a deficient number, since it is larger than the sum of its proper divisors (38755695).

1201425553 is an equidigital number, since it uses as much as digits as its factorization.

1201425553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38755694.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1201425553 is about 34661.5861293161. The cubic root of 1201425553 is about 1063.0792015814.

Adding to 1201425553 its reverse (3555241021), we get a palindrome (4756666574).

The spelling of 1201425553 in words is "one billion, two hundred one million, four hundred twenty-five thousand, five hundred fifty-three".