330401561 has 6 divisors (see below), whose sum is σ = 384344730. Its totient is φ = 283201296.

The previous prime is 330401557. The next prime is 330401567. The reversal of 330401561 is 165104033.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 302099161 + 28302400 = 17381^2 + 5320^2 .

It is not a de Polignac number, because 330401561 - 2² = 330401557 is a prime.

It is a super-2 number, since 2×330401561² = 218330383022473442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (330401567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3371396 + ... + 3371493.

It is an arithmetic number, because the mean of its divisors is an integer number (64057455).

Almost surely, 2^330401561 is an apocalyptic number.

It is an amenable number.

330401561 is a deficient number, since it is larger than the sum of its proper divisors (53943169).

330401561 is an equidigital number, since it uses as much as digits as its factorization.

330401561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6742903 (or 6742896 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 330401561 is about 18176.9513670472. The cubic root of 330401561 is about 691.3225080166.

Adding to 330401561 its reverse (165104033), we get a palindrome (495505594).

The spelling of 330401561 in words is "three hundred thirty million, four hundred one thousand, five hundred sixty-one".