745901521 has 8 divisors (see below), whose sum is σ = 764313440. Its totient is φ = 727538112.

The previous prime is 745901501. The next prime is 745901539. The reversal of 745901521 is 125109547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745901521 - 2¹⁷ = 745770449 is a prime.

It is a super-3 number, since 3×745901521³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745901501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20041 + ... + 43513.

It is an arithmetic number, because the mean of its divisors is an integer number (95539180).

Almost surely, 2^745901521 is an apocalyptic number.

It is an amenable number.

745901521 is a deficient number, since it is larger than the sum of its proper divisors (18411919).

745901521 is a wasteful number, since it uses less digits than its factorization.

745901521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24255.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 745901521 is about 27311.1977218137. The cubic root of 745901521 is about 906.9022880239.

The spelling of 745901521 in words is "seven hundred forty-five million, nine hundred one thousand, five hundred twenty-one".