1553621151 has 4 divisors (see below), whose sum is σ = 2071494872. Its totient is φ = 1035747432.

The previous prime is 1553621149. The next prime is 1553621183. The reversal of 1553621151 is 1511263551.

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

It is not a de Polignac number, because 1553621151 - 2¹ = 1553621149 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 (1553621191) 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, 258936856 + ... + 258936861.

It is an arithmetic number, because the mean of its divisors is an integer number (517873718).

Almost surely, 2^1553621151 is an apocalyptic number.

1553621151 is a deficient number, since it is larger than the sum of its proper divisors (517873721).

1553621151 is an equidigital number, since it uses as much as digits as its factorization.

1553621151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517873720.

The product of its digits is 4500, while the sum is 30.

The square root of 1553621151 is about 39416.0012050944. The cubic root of 1553621151 is about 1158.1950603725.

The spelling of 1553621151 in words is "one billion, five hundred fifty-three million, six hundred twenty-one thousand, one hundred fifty-one".