1552021161 has 4 divisors (see below), whose sum is σ = 2069361552. Its totient is φ = 1034680772.

The previous prime is 1552021157. The next prime is 1552021189. The reversal of 1552021161 is 1611202551.

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.

It is a cyclic number.

It is not a de Polignac number, because 1552021161 - 2² = 1552021157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1552028161) 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, 258670191 + ... + 258670196.

It is an arithmetic number, because the mean of its divisors is an integer number (517340388).

Almost surely, 2^1552021161 is an apocalyptic number.

It is an amenable number.

1552021161 is a deficient number, since it is larger than the sum of its proper divisors (517340391).

1552021161 is an equidigital number, since it uses as much as digits as its factorization.

1552021161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517340390.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1552021161 is about 39395.6997780215. The cubic root of 1552021161 is about 1157.7973364242.

The spelling of 1552021161 in words is "one billion, five hundred fifty-two million, twenty-one thousand, one hundred sixty-one".