345191531 has 2 divisors, whose sum is σ = 345191532. Its totient is φ = 345191530.

The previous prime is 345191513. The next prime is 345191543. The reversal of 345191531 is 135191543.

Together with previous prime (345191513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (135191543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345191531 - 2⁶ = 345191467 is a prime.

It is a super-2 number, since 2×345191531² = 238314386148247922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (345191591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172595765 + 172595766.

It is an arithmetic number, because the mean of its divisors is an integer number (172595766).

Almost surely, 2^345191531 is an apocalyptic number.

345191531 is a deficient number, since it is larger than the sum of its proper divisors (1).

345191531 is an equidigital number, since it uses as much as digits as its factorization.

345191531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 345191531 is about 18579.3307468272. The cubic root of 345191531 is about 701.4876735003.

The spelling of 345191531 in words is "three hundred forty-five million, one hundred ninety-one thousand, five hundred thirty-one".