961378939 has 4 divisors (see below), whose sum is σ = 961446640. Its totient is φ = 961311240.

The previous prime is 961378933. The next prime is 961378961. The reversal of 961378939 is 939873169.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 939873169 = 17 ⋅55286657.

It is a cyclic number.

It is not a de Polignac number, because 961378939 - 2⁹ = 961378427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 961378939.

It is not an unprimeable number, because it can be changed into a prime (961378933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3447 + ... + 43984.

It is an arithmetic number, because the mean of its divisors is an integer number (240361660).

Almost surely, 2^961378939 is an apocalyptic number.

961378939 is a deficient number, since it is larger than the sum of its proper divisors (67701).

961378939 is a wasteful number, since it uses less digits than its factorization.

961378939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67700.

The product of its digits is 2204496, while the sum is 55.

The square root of 961378939 is about 31006.1113169646. Note that the first 3 decimals coincide. The cubic root of 961378939 is about 986.9569309869.

The spelling of 961378939 in words is "nine hundred sixty-one million, three hundred seventy-eight thousand, nine hundred thirty-nine".