745535381 has 4 divisors (see below), whose sum is σ = 750284172. Its totient is φ = 740786592.

The previous prime is 745535359. The next prime is 745535389. The reversal of 745535381 is 183535547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183535547 = 13 ⋅14118119.

It can be written as a sum of positive squares in 2 ways, for example, as 107972881 + 637562500 = 10391^2 + 25250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745535381 is a prime.

It is a super-2 number, since 2×745535381² = 1111646008645630322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745535389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2374160 + ... + 2374473.

It is an arithmetic number, because the mean of its divisors is an integer number (187571043).

Almost surely, 2^745535381 is an apocalyptic number.

It is an amenable number.

745535381 is a deficient number, since it is larger than the sum of its proper divisors (4748791).

745535381 is a wasteful number, since it uses less digits than its factorization.

745535381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748790.

The product of its digits is 252000, while the sum is 41.

The square root of 745535381 is about 27304.4937876533. The cubic root of 745535381 is about 906.7538736373.

The spelling of 745535381 in words is "seven hundred forty-five million, five hundred thirty-five thousand, three hundred eighty-one".