961021621 has 16 divisors (see below), whose sum is σ = 1111428864. Its totient is φ = 813930624.

The previous prime is 961021619. The next prime is 961021631. The reversal of 961021621 is 126120169.

It is a cyclic number.

It is not a de Polignac number, because 961021621 - 2¹ = 961021619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961021621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961021631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400401 + ... + 402793.

It is an arithmetic number, because the mean of its divisors is an integer number (69464304).

Almost surely, 2^961021621 is an apocalyptic number.

It is an amenable number.

961021621 is a deficient number, since it is larger than the sum of its proper divisors (150407243).

961021621 is a wasteful number, since it uses less digits than its factorization.

961021621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

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

The square root of 961021621 is about 31000.3487238450. The cubic root of 961021621 is about 986.8346409573.

The spelling of 961021621 in words is "nine hundred sixty-one million, twenty-one thousand, six hundred twenty-one".