345191591 has 2 divisors, whose sum is σ = 345191592. Its totient is φ = 345191590.

The previous prime is 345191557. The next prime is 345191593. The reversal of 345191591 is 195191543.

It is a strong prime.

It is an emirp because it is prime and its reverse (195191543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345191591 is a prime.

It is a super-2 number, since 2×345191591² = 238314468994222562, which contains 22 as substring.

Together with 345191593, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_18559073 and since 345191591 and 18559073 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345191593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172595795 + 172595796.

It is an arithmetic number, because the mean of its divisors is an integer number (172595796).

Almost surely, 2^345191591 is an apocalyptic number.

345191591 is a deficient number, since it is larger than the sum of its proper divisors (1).

345191591 is an equidigital number, since it uses as much as digits as its factorization.

345191591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 38.

The square root of 345191591 is about 18579.3323615247. The cubic root of 345191591 is about 701.4877141437.

The spelling of 345191591 in words is "three hundred forty-five million, one hundred ninety-one thousand, five hundred ninety-one".