321150661 has 4 divisors (see below), whose sum is σ = 345854572. Its totient is φ = 296446752.

The previous prime is 321150659. The next prime is 321150719. The reversal of 321150661 is 166051123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166051123 = 7 ⋅23721589.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 299117025 = 4694^2 + 17295^2 .

It is a cyclic number.

It is not a de Polignac number, because 321150661 - 2¹ = 321150659 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 (321150061) 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, 12351936 + ... + 12351961.

It is an arithmetic number, because the mean of its divisors is an integer number (86463643).

Almost surely, 2^321150661 is an apocalyptic number.

It is an amenable number.

321150661 is a deficient number, since it is larger than the sum of its proper divisors (24703911).

321150661 is a wasteful number, since it uses less digits than its factorization.

321150661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24703910.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 321150661 is about 17920.6769124383. The cubic root of 321150661 is about 684.8092324015.

The spelling of 321150661 in words is "three hundred twenty-one million, one hundred fifty thousand, six hundred sixty-one".