745531 has 2 divisors, whose sum is σ = 745532. Its totient is φ = 745530.

The previous prime is 745529. The next prime is 745543. The reversal of 745531 is 135547.

745531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 745531 - 2¹ = 745529 is a prime.

It is a super-2 number, since 2×745531² = 1111632943922, which contains 22 as substring.

Together with 745529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 745496 and 745505.

It is not a weakly prime, because it can be changed into another prime (745231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372765 + 372766.

It is an arithmetic number, because the mean of its divisors is an integer number (372766).

2⁷⁴⁵⁵³¹ is an apocalyptic number.

745531 is a deficient number, since it is larger than the sum of its proper divisors (1).

745531 is an equidigital number, since it uses as much as digits as its factorization.

745531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 25.

The square root of 745531 is about 863.4413703315. The cubic root of 745531 is about 90.6752097510.

The spelling of 745531 in words is "seven hundred forty-five thousand, five hundred thirty-one".