391233673 has 2 divisors, whose sum is σ = 391233674. Its totient is φ = 391233672.

The previous prime is 391233659. The next prime is 391233683. The reversal of 391233673 is 376332193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390971529 + 262144 = 19773^2 + 512^2 .

It is an emirp because it is prime and its reverse (376332193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391233673 - 2¹⁷ = 391102601 is a prime.

It is not a weakly prime, because it can be changed into another prime (391233683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195616836 + 195616837.

It is an arithmetic number, because the mean of its divisors is an integer number (195616837).

Almost surely, 2^391233673 is an apocalyptic number.

It is an amenable number.

391233673 is a deficient number, since it is larger than the sum of its proper divisors (1).

391233673 is an equidigital number, since it uses as much as digits as its factorization.

391233673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 37.

The square root of 391233673 is about 19779.6277265271. The cubic root of 391233673 is about 731.3839219204.

The spelling of 391233673 in words is "three hundred ninety-one million, two hundred thirty-three thousand, six hundred seventy-three".