220312397 has 2 divisors, whose sum is σ = 220312398. Its totient is φ = 220312396.

The previous prime is 220312373. The next prime is 220312403. The reversal of 220312397 is 793213022.

220312397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187662601 + 32649796 = 13699^2 + 5714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220312397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220312307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110156198 + 110156199.

It is an arithmetic number, because the mean of its divisors is an integer number (110156199).

Almost surely, 2^220312397 is an apocalyptic number.

It is an amenable number.

220312397 is a deficient number, since it is larger than the sum of its proper divisors (1).

220312397 is an equidigital number, since it uses as much as digits as its factorization.

220312397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 220312397 is about 14842.9241391311. The cubic root of 220312397 is about 603.9666781684.

The spelling of 220312397 in words is "two hundred twenty million, three hundred twelve thousand, three hundred ninety-seven".