945981 has 12 divisors (see below), whose sum is σ = 1382940. Its totient is φ = 623040.

The previous prime is 945961. The next prime is 945983. The reversal of 945981 is 189549.

It can be written as a sum of positive squares in 2 ways, for example, as 549081 + 396900 = 741^2 + 630^2 .

It is not a de Polignac number, because 945981 - 2⁵ = 945949 is a prime.

It is a super-2 number, since 2×945981² = 1789760104722, which contains 22 as substring.

945981 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 945981.

It is not an unprimeable number, because it can be changed into a prime (945983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (115245).

2⁹⁴⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

945981 is a deficient number, since it is larger than the sum of its proper divisors (436959).

945981 is a wasteful number, since it uses less digits than its factorization.

945981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276 (or 1273 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 945981 is about 972.6155458350. The cubic root of 945981 is about 98.1659343459.

The spelling of 945981 in words is "nine hundred forty-five thousand, nine hundred eighty-one".