1601251161 has 4 divisors (see below), whose sum is σ = 2135001552. Its totient is φ = 1067500772.

The previous prime is 1601251139. The next prime is 1601251177. The reversal of 1601251161 is 1611521061.

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 1601251161 - 2⁵ = 1601251129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1601251111) 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, 266875191 + ... + 266875196.

It is an arithmetic number, because the mean of its divisors is an integer number (533750388).

Almost surely, 2^1601251161 is an apocalyptic number.

It is an amenable number.

1601251161 is a deficient number, since it is larger than the sum of its proper divisors (533750391).

1601251161 is an equidigital number, since it uses as much as digits as its factorization.

1601251161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533750390.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1601251161 is about 40015.6364562654. The cubic root of 1601251161 is about 1169.9118839330.

The spelling of 1601251161 in words is "one billion, six hundred one million, two hundred fifty-one thousand, one hundred sixty-one".