349691491 has 2 divisors, whose sum is σ = 349691492. Its totient is φ = 349691490.

The previous prime is 349691453. The next prime is 349691519. The reversal of 349691491 is 194196943.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 349691491 - 2²¹ = 347594339 is a prime.

It is not a weakly prime, because it can be changed into another prime (349692491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174845745 + 174845746.

It is an arithmetic number, because the mean of its divisors is an integer number (174845746).

Almost surely, 2^349691491 is an apocalyptic number.

349691491 is a deficient number, since it is larger than the sum of its proper divisors (1).

349691491 is an equidigital number, since it uses as much as digits as its factorization.

349691491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 349691491 is about 18700.0398662677. The cubic root of 349691491 is about 704.5227499490.

The spelling of 349691491 in words is "three hundred forty-nine million, six hundred ninety-one thousand, four hundred ninety-one".