961221669 has 16 divisors (see below), whose sum is σ = 1289587200. Its totient is φ = 636848496.

The previous prime is 961221661. The next prime is 961221689. The reversal of 961221669 is 966122169.

It is a happy number.

It is not a de Polignac number, because 961221669 - 2³ = 961221661 is a prime.

It is a super-2 number, since 2×961221669² = 1847894193910291122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 961221669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961221661) 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, 371422 + ... + 374000.

It is an arithmetic number, because the mean of its divisors is an integer number (80599200).

Almost surely, 2^961221669 is an apocalyptic number.

It is an amenable number.

961221669 is a deficient number, since it is larger than the sum of its proper divisors (328365531).

961221669 is a wasteful number, since it uses less digits than its factorization.

961221669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304.

The product of its digits is 69984, while the sum is 42.

The square root of 961221669 is about 31003.5751003009. The cubic root of 961221669 is about 986.9031099683.

The spelling of 961221669 in words is "nine hundred sixty-one million, two hundred twenty-one thousand, six hundred sixty-nine".