39394449491 has 2 divisors, whose sum is σ = 39394449492. Its totient is φ = 39394449490.

The previous prime is 39394449371. The next prime is 39394449517. The reversal of 39394449491 is 19494449393.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39394449491 is a prime.

It is a super-3 number, since 3×39394449491³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39394449491.

It is not a weakly prime, because it can be changed into another prime (39394446491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19697224745 + 19697224746.

It is an arithmetic number, because the mean of its divisors is an integer number (19697224746).

Almost surely, 2^39394449491 is an apocalyptic number.

39394449491 is a deficient number, since it is larger than the sum of its proper divisors (1).

39394449491 is an equidigital number, since it uses as much as digits as its factorization.

39394449491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 59.

The spelling of 39394449491 in words is "thirty-nine billion, three hundred ninety-four million, four hundred forty-nine thousand, four hundred ninety-one".