321161564 has 6 divisors (see below), whose sum is σ = 562032744. Its totient is φ = 160580780.

The previous prime is 321161557. The next prime is 321161567. The reversal of 321161564 is 465161123.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321161567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40145192 + ... + 40145199.

It is an arithmetic number, because the mean of its divisors is an integer number (93672124).

Almost surely, 2^321161564 is an apocalyptic number.

It is an amenable number.

321161564 is a deficient number, since it is larger than the sum of its proper divisors (240871180).

321161564 is a wasteful number, since it uses less digits than its factorization.

321161564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80290395 (or 80290393 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 321161564 is about 17920.9811115352. The cubic root of 321161564 is about 684.8169820255.

The spelling of 321161564 in words is "three hundred twenty-one million, one hundred sixty-one thousand, five hundred sixty-four".