921284969641 has 4 divisors (see below), whose sum is σ = 953053416900. Its totient is φ = 889516522384.

The previous prime is 921284969603. The next prime is 921284969669. The reversal of 921284969641 is 146969482129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145793385241 + 775491584400 = 381829^2 + 880620^2 .

It is a cyclic number.

It is not a de Polignac number, because 921284969641 - 2¹¹ = 921284967593 is a prime.

It is a super-4 number, since 4×921284969641⁴ (a number of 49 digits) contains 4444 as substring.

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 921284969641.

It is not an unprimeable number, because it can be changed into a prime (921284969441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15884223586 + ... + 15884223643.

It is an arithmetic number, because the mean of its divisors is an integer number (238263354225).

Almost surely, 2^921284969641 is an apocalyptic number.

It is an amenable number.

921284969641 is a deficient number, since it is larger than the sum of its proper divisors (31768447259).

921284969641 is a wasteful number, since it uses less digits than its factorization.

921284969641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31768447258.

The product of its digits is 13436928, while the sum is 61.

The spelling of 921284969641 in words is "nine hundred twenty-one billion, two hundred eighty-four million, nine hundred sixty-nine thousand, six hundred forty-one".