1201553403 has 4 divisors (see below), whose sum is σ = 1602071208. Its totient is φ = 801035600.

The previous prime is 1201553399. The next prime is 1201553413. The reversal of 1201553403 is 3043551021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201553403 - 2² = 1201553399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201553413) 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, 200258898 + ... + 200258903.

It is an arithmetic number, because the mean of its divisors is an integer number (400517802).

Almost surely, 2^1201553403 is an apocalyptic number.

1201553403 is a deficient number, since it is larger than the sum of its proper divisors (400517805).

1201553403 is an equidigital number, since it uses as much as digits as its factorization.

1201553403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400517804.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1201553403 is about 34663.4303409227. The cubic root of 1201553403 is about 1063.1169095234.

The spelling of 1201553403 in words is "one billion, two hundred one million, five hundred fifty-three thousand, four hundred three".