745358921 has 2 divisors, whose sum is σ = 745358922. Its totient is φ = 745358920.

The previous prime is 745358893. The next prime is 745358927. The reversal of 745358921 is 129853547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703575625 + 41783296 = 26525^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 745358921 - 2²² = 741164617 is a prime.

It is a super-2 number, since 2×745358921² = 1111119842228568482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (745358927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372679460 + 372679461.

It is an arithmetic number, because the mean of its divisors is an integer number (372679461).

Almost surely, 2^745358921 is an apocalyptic number.

It is an amenable number.

745358921 is a deficient number, since it is larger than the sum of its proper divisors (1).

745358921 is an equidigital number, since it uses as much as digits as its factorization.

745358921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 745358921 is about 27301.2622601960. The cubic root of 745358921 is about 906.6823284462.

The spelling of 745358921 in words is "seven hundred forty-five million, three hundred fifty-eight thousand, nine hundred twenty-one".