1651012161 has 4 divisors (see below), whose sum is σ = 2201349552. Its totient is φ = 1100674772.

The previous prime is 1651012123. The next prime is 1651012177. The reversal of 1651012161 is 1612101561.

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 1651012161 - 2¹¹ = 1651010113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1651012361) 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, 275168691 + ... + 275168696.

It is an arithmetic number, because the mean of its divisors is an integer number (550337388).

Almost surely, 2^1651012161 is an apocalyptic number.

It is an amenable number.

1651012161 is a deficient number, since it is larger than the sum of its proper divisors (550337391).

1651012161 is an equidigital number, since it uses as much as digits as its factorization.

1651012161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550337390.

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

The square root of 1651012161 is about 40632.6489537662. The cubic root of 1651012161 is about 1181.9073245098.

The spelling of 1651012161 in words is "one billion, six hundred fifty-one million, twelve thousand, one hundred sixty-one".