164311561 has 8 divisors (see below), whose sum is σ = 169296840. Its totient is φ = 159355008.

The previous prime is 164311549. The next prime is 164311571. The reversal of 164311561 is 165113461.

It can be written as a sum of positive squares in 4 ways, for example, as 37884025 + 126427536 = 6155^2 + 11244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164311561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164311571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4725 + ... + 18733.

It is an arithmetic number, because the mean of its divisors is an integer number (21162105).

Almost surely, 2^164311561 is an apocalyptic number.

It is an amenable number.

164311561 is a deficient number, since it is larger than the sum of its proper divisors (4985279).

164311561 is a wasteful number, since it uses less digits than its factorization.

164311561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14363.

The product of its digits is 2160, while the sum is 28.

The square root of 164311561 is about 12818.4071163308. The cubic root of 164311561 is about 547.7167727201.

The spelling of 164311561 in words is "one hundred sixty-four million, three hundred eleven thousand, five hundred sixty-one".