961381 has 4 divisors (see below), whose sum is σ = 1012000. Its totient is φ = 910764.

The previous prime is 961339. The next prime is 961393. The reversal of 961381 is 183169.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 961381 - 2¹¹ = 959333 is a prime.

It is a super-2 number, since 2×961381² = 1848506854322, which contains 22 as substring.

It is an Ulam number.

It is the 981-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961981) by changing a digit.

It is a nontrivial repunit in base 980.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25281 + ... + 25318.

It is an arithmetic number, because the mean of its divisors is an integer number (253000).

2⁹⁶¹³⁸¹ is an apocalyptic number.

It is an amenable number.

961381 is a deficient number, since it is larger than the sum of its proper divisors (50619).

961381 is a wasteful number, since it uses less digits than its factorization.

961381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50618.

The product of its digits is 1296, while the sum is 28.

The square root of 961381 is about 980.5003824579. The cubic root of 961381 is about 98.6957636264.

The spelling of 961381 in words is "nine hundred sixty-one thousand, three hundred eighty-one".