1345901681 has 2 divisors, whose sum is σ = 1345901682. Its totient is φ = 1345901680.

The previous prime is 1345901647. The next prime is 1345901723. The reversal of 1345901681 is 1861095431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1311091681 + 34810000 = 36209^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345901681 - 2¹⁰ = 1345900657 is a prime.

It is a super-2 number, since 2×1345901681² = 3622902669837251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1345901581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672950840 + 672950841.

It is an arithmetic number, because the mean of its divisors is an integer number (672950841).

Almost surely, 2^1345901681 is an apocalyptic number.

It is an amenable number.

1345901681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345901681 is an equidigital number, since it uses as much as digits as its factorization.

1345901681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1345901681 is about 36686.5326925290. The cubic root of 1345901681 is about 1104.0899206605.

The spelling of 1345901681 in words is "one billion, three hundred forty-five million, nine hundred one thousand, six hundred eighty-one".