1345457273 has 2 divisors, whose sum is σ = 1345457274. Its totient is φ = 1345457272.

The previous prime is 1345457249. The next prime is 1345457287. The reversal of 1345457273 is 3727545431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242069049 + 103388224 = 35243^2 + 10168^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345457273 - 2⁶ = 1345457209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1345457273.

It is not a weakly prime, because it can be changed into another prime (1345457293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672728636 + 672728637.

It is an arithmetic number, because the mean of its divisors is an integer number (672728637).

Almost surely, 2^1345457273 is an apocalyptic number.

It is an amenable number.

1345457273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345457273 is an equidigital number, since it uses as much as digits as its factorization.

1345457273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 41.

The square root of 1345457273 is about 36680.4753649677. The cubic root of 1345457273 is about 1103.9683861742.

The spelling of 1345457273 in words is "one billion, three hundred forty-five million, four hundred fifty-seven thousand, two hundred seventy-three".