391740361 has 2 divisors, whose sum is σ = 391740362. Its totient is φ = 391740360.

The previous prime is 391740319. The next prime is 391740379. The reversal of 391740361 is 163047193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367297225 + 24443136 = 19165^2 + 4944^2 .

It is a cyclic number.

It is not a de Polignac number, because 391740361 - 2²³ = 383351753 is a prime.

It is not a weakly prime, because it can be changed into another prime (391740311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195870180 + 195870181.

It is an arithmetic number, because the mean of its divisors is an integer number (195870181).

Almost surely, 2^391740361 is an apocalyptic number.

It is an amenable number.

391740361 is a deficient number, since it is larger than the sum of its proper divisors (1).

391740361 is an equidigital number, since it uses as much as digits as its factorization.

391740361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 391740361 is about 19792.4319122234. The cubic root of 391740361 is about 731.6995249439.

The spelling of 391740361 in words is "three hundred ninety-one million, seven hundred forty thousand, three hundred sixty-one".