1345740691 has 2 divisors, whose sum is σ = 1345740692. Its totient is φ = 1345740690.

The previous prime is 1345740673. The next prime is 1345740701. The reversal of 1345740691 is 1960475431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1345740691 - 2¹⁹ = 1345216403 is a prime.

It is a super-2 number, since 2×1345740691² = 3622036014826314962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1345750691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672870345 + 672870346.

It is an arithmetic number, because the mean of its divisors is an integer number (672870346).

Almost surely, 2^1345740691 is an apocalyptic number.

1345740691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345740691 is an equidigital number, since it uses as much as digits as its factorization.

1345740691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1345740691 is about 36684.3384975114. The cubic root of 1345740691 is about 1104.0458970080.

It can be divided in two parts, 1345740 and 691, that added together give a palindrome (1346431).

The spelling of 1345740691 in words is "one billion, three hundred forty-five million, seven hundred forty thousand, six hundred ninety-one".