745733621 has 2 divisors, whose sum is σ = 745733622. Its totient is φ = 745733620.

The previous prime is 745733609. The next prime is 745733647. The reversal of 745733621 is 126337547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719580625 + 26152996 = 26825^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 745733621 - 2¹⁴ = 745717237 is a prime.

It is a super-2 number, since 2×745733621² = 1112237266979543282, 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 (745733321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372866810 + 372866811.

It is an arithmetic number, because the mean of its divisors is an integer number (372866811).

Almost surely, 2^745733621 is an apocalyptic number.

It is an amenable number.

745733621 is a deficient number, since it is larger than the sum of its proper divisors (1).

745733621 is an equidigital number, since it uses as much as digits as its factorization.

745733621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 38.

The square root of 745733621 is about 27308.1237180441. The cubic root of 745733621 is about 906.8342360017.

The spelling of 745733621 in words is "seven hundred forty-five million, seven hundred thirty-three thousand, six hundred twenty-one".