391046641 has 2 divisors, whose sum is σ = 391046642. Its totient is φ = 391046640.

The previous prime is 391046633. The next prime is 391046647. The reversal of 391046641 is 146640193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312547041 + 78499600 = 17679^2 + 8860^2 .

It is a cyclic number.

It is not a de Polignac number, because 391046641 - 2³ = 391046633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391046597 and 391046606.

It is not a weakly prime, because it can be changed into another prime (391046647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195523320 + 195523321.

It is an arithmetic number, because the mean of its divisors is an integer number (195523321).

Almost surely, 2^391046641 is an apocalyptic number.

It is an amenable number.

391046641 is a deficient number, since it is larger than the sum of its proper divisors (1).

391046641 is an equidigital number, since it uses as much as digits as its factorization.

391046641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 391046641 is about 19774.8992664944. The cubic root of 391046641 is about 731.2673556063.

The spelling of 391046641 in words is "three hundred ninety-one million, forty-six thousand, six hundred forty-one".