745631 has 2 divisors, whose sum is σ = 745632. Its totient is φ = 745630.

The previous prime is 745621. The next prime is 745649. The reversal of 745631 is 136547.

It is a weak prime.

It is an emirp because it is prime and its reverse (136547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745631 - 2⁶ = 745567 is a prime.

It is a super-2 number, since 2×745631² = 1111931176322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 745631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372815 + 372816.

It is an arithmetic number, because the mean of its divisors is an integer number (372816).

2⁷⁴⁵⁶³¹ is an apocalyptic number.

745631 is a deficient number, since it is larger than the sum of its proper divisors (1).

745631 is an equidigital number, since it uses as much as digits as its factorization.

745631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 745631 is about 863.4992762012. The cubic root of 745631 is about 90.6792637365.

The spelling of 745631 in words is "seven hundred forty-five thousand, six hundred thirty-one".