745981 has 2 divisors, whose sum is σ = 745982. Its totient is φ = 745980.

The previous prime is 745973. The next prime is 745993. The reversal of 745981 is 189547.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 737881 + 8100 = 859^2 + 90^2 .

It is an emirp because it is prime and its reverse (189547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745981 - 2³ = 745973 is a prime.

It is a super-2 number, since 2×745981² = 1112975304722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372990 + 372991.

It is an arithmetic number, because the mean of its divisors is an integer number (372991).

2⁷⁴⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

745981 is a deficient number, since it is larger than the sum of its proper divisors (1).

745981 is an equidigital number, since it uses as much as digits as its factorization.

745981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 745981 is about 863.7019161725. The cubic root of 745981 is about 90.6934498320.

The spelling of 745981 in words is "seven hundred forty-five thousand, nine hundred eighty-one".