391658720941 has 2 divisors, whose sum is σ = 391658720942. Its totient is φ = 391658720940.

The previous prime is 391658720939. The next prime is 391658720953. The reversal of 391658720941 is 149027856193.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334228515625 + 57430205316 = 578125^2 + 239646^2 .

It is an emirp because it is prime and its reverse (149027856193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391658720941 - 2¹ = 391658720939 is a prime.

It is a super-2 number, since 2×391658720941² (a number of 24 digits) contains 22 as substring.

Together with 391658720939, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391658720041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195829360470 + 195829360471.

It is an arithmetic number, because the mean of its divisors is an integer number (195829360471).

It is a 1-persistent number, because it is pandigital, but 2⋅391658720941 = 783317441882 is not.

Almost surely, 2^391658720941 is an apocalyptic number.

It is an amenable number.

391658720941 is a deficient number, since it is larger than the sum of its proper divisors (1).

391658720941 is an equidigital number, since it uses as much as digits as its factorization.

391658720941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 391658720941 in words is "three hundred ninety-one billion, six hundred fifty-eight million, seven hundred twenty thousand, nine hundred forty-one".