345531551 has 2 divisors, whose sum is σ = 345531552. Its totient is φ = 345531550.

The previous prime is 345531533. The next prime is 345531577. The reversal of 345531551 is 155135543.

It is a weak prime.

It is an emirp because it is prime and its reverse (155135543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345531551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345536551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172765775 + 172765776.

It is an arithmetic number, because the mean of its divisors is an integer number (172765776).

Almost surely, 2^345531551 is an apocalyptic number.

345531551 is a deficient number, since it is larger than the sum of its proper divisors (1).

345531551 is an equidigital number, since it uses as much as digits as its factorization.

345531551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 32.

The square root of 345531551 is about 18588.4789856513. The cubic root of 345531551 is about 701.7179239986.

The spelling of 345531551 in words is "three hundred forty-five million, five hundred thirty-one thousand, five hundred fifty-one".