391541387 has 2 divisors, whose sum is σ = 391541388. Its totient is φ = 391541386.

The previous prime is 391541333. The next prime is 391541429. The reversal of 391541387 is 783145193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391541387 - 2⁶ = 391541323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (391541317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195770693 + 195770694.

It is an arithmetic number, because the mean of its divisors is an integer number (195770694).

Almost surely, 2^391541387 is an apocalyptic number.

391541387 is a deficient number, since it is larger than the sum of its proper divisors (1).

391541387 is an equidigital number, since it uses as much as digits as its factorization.

391541387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 391541387 is about 19787.4047565617. The cubic root of 391541387 is about 731.5756215868.

The spelling of 391541387 in words is "three hundred ninety-one million, five hundred forty-one thousand, three hundred eighty-seven".