961403021 has 4 divisors (see below), whose sum is σ = 1012003200. Its totient is φ = 910802844.

The previous prime is 961403011. The next prime is 961403083. The reversal of 961403021 is 120304169.

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 961403021 - 2²² = 957208717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961403011) 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, 25300061 + ... + 25300098.

It is an arithmetic number, because the mean of its divisors is an integer number (253000800).

Almost surely, 2^961403021 is an apocalyptic number.

It is an amenable number.

961403021 is a deficient number, since it is larger than the sum of its proper divisors (50600179).

961403021 is a wasteful number, since it uses less digits than its factorization.

961403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50600178.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 961403021 is about 31006.4996573299. The cubic root of 961403021 is about 986.9651718228.

The spelling of 961403021 in words is "nine hundred sixty-one million, four hundred three thousand, twenty-one".