945381 has 4 divisors (see below), whose sum is σ = 1260512. Its totient is φ = 630252.

The previous prime is 945377. The next prime is 945389. The reversal of 945381 is 183549.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 945381 - 2² = 945377 is a prime.

It is a super-2 number, since 2×945381² = 1787490470322, which contains 22 as substring.

It is a D-number.

It is a Duffinian 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 945381.

It is not an unprimeable number, because it can be changed into a prime (945389) 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, 157561 + ... + 157566.

It is an arithmetic number, because the mean of its divisors is an integer number (315128).

2⁹⁴⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

945381 is a deficient number, since it is larger than the sum of its proper divisors (315131).

945381 is a wasteful number, since it uses less digits than its factorization.

945381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315130.

The product of its digits is 4320, while the sum is 30.

The square root of 945381 is about 972.3070502676. The cubic root of 945381 is about 98.1451756423.

It can be divided in two parts, 945 and 381, that added together give a triangular number (1326 = T₅₁).

The spelling of 945381 in words is "nine hundred forty-five thousand, three hundred eighty-one".