391336061 has 2 divisors, whose sum is σ = 391336062. Its totient is φ = 391336060.

The previous prime is 391335983. The next prime is 391336069. The reversal of 391336061 is 160633193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212284900 + 179051161 = 14570^2 + 13381^2 .

It is a cyclic number.

It is not a de Polignac number, because 391336061 - 2²² = 387141757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391336069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195668030 + 195668031.

It is an arithmetic number, because the mean of its divisors is an integer number (195668031).

Almost surely, 2^391336061 is an apocalyptic number.

It is an amenable number.

391336061 is a deficient number, since it is larger than the sum of its proper divisors (1).

391336061 is an equidigital number, since it uses as much as digits as its factorization.

391336061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 391336061 is about 19782.2157757922. The cubic root of 391336061 is about 731.4477187512.

The spelling of 391336061 in words is "three hundred ninety-one million, three hundred thirty-six thousand, sixty-one".