745735561 has 2 divisors, whose sum is σ = 745735562. Its totient is φ = 745735560.

The previous prime is 745735547. The next prime is 745735567. The reversal of 745735561 is 165537547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725763600 + 19971961 = 26940^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 745735561 - 2⁷ = 745735433 is a prime.

It is a super-2 number, since 2×745735561² = 1112243053879969442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (745735567) 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, 372867780 + 372867781.

It is an arithmetic number, because the mean of its divisors is an integer number (372867781).

Almost surely, 2^745735561 is an apocalyptic number.

It is an amenable number.

745735561 is a deficient number, since it is larger than the sum of its proper divisors (1).

745735561 is an equidigital number, since it uses as much as digits as its factorization.

745735561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441000, while the sum is 43.

The square root of 745735561 is about 27308.1592385866. The cubic root of 745735561 is about 906.8350223669.

The spelling of 745735561 in words is "seven hundred forty-five million, seven hundred thirty-five thousand, five hundred sixty-one".