961391 has 4 divisors (see below), whose sum is σ = 963384. Its totient is φ = 959400.

The previous prime is 961339. The next prime is 961393. The reversal of 961391 is 193169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193169 = 29 ⋅6661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961391 is a prime.

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 961391.

It is not an unprimeable number, because it can be changed into a prime (961393) 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, 236 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (240846).

2⁹⁶¹³⁹¹ is an apocalyptic number.

961391 is a deficient number, since it is larger than the sum of its proper divisors (1993).

961391 is a wasteful number, since it uses less digits than its factorization.

961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 1458, while the sum is 29.

The square root of 961391 is about 980.5054818817. The cubic root of 961391 is about 98.6961058266.

The spelling of 961391 in words is "nine hundred sixty-one thousand, three hundred ninety-one".