745753621 has 2 divisors, whose sum is σ = 745753622. Its totient is φ = 745753620.

The previous prime is 745753597. The next prime is 745753627. The reversal of 745753621 is 126357547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671535396 + 74218225 = 25914^2 + 8615^2 .

It is a cyclic number.

It is not a de Polignac number, because 745753621 - 2²⁷ = 611535893 is a prime.

It is a super-2 number, since 2×745753621² = 1112296926469223282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745753627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372876810 + 372876811.

It is an arithmetic number, because the mean of its divisors is an integer number (372876811).

Almost surely, 2^745753621 is an apocalyptic number.

It is an amenable number.

745753621 is a deficient number, since it is larger than the sum of its proper divisors (1).

745753621 is an equidigital number, since it uses as much as digits as its factorization.

745753621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 40.

The square root of 745753621 is about 27308.4899069868. The cubic root of 745753621 is about 906.8423427940.

The spelling of 745753621 in words is "seven hundred forty-five million, seven hundred fifty-three thousand, six hundred twenty-one".