391309483 has 2 divisors, whose sum is σ = 391309484. Its totient is φ = 391309482.

The previous prime is 391309439. The next prime is 391309517. The reversal of 391309483 is 384903193.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391309483 is a prime.

It is a super-2 number, since 2×391309483² = 306246222971454578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (391309423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195654741 + 195654742.

It is an arithmetic number, because the mean of its divisors is an integer number (195654742).

Almost surely, 2^391309483 is an apocalyptic number.

391309483 is a deficient number, since it is larger than the sum of its proper divisors (1).

391309483 is an equidigital number, since it uses as much as digits as its factorization.

391309483 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 391309483 is about 19781.5439993950. The cubic root of 391309483 is about 731.4311593627.

The spelling of 391309483 in words is "three hundred ninety-one million, three hundred nine thousand, four hundred eighty-three".