921143961 has 16 divisors (see below), whose sum is σ = 1368273600. Its totient is φ = 612468864.

The previous prime is 921143911. The next prime is 921144017. The reversal of 921143961 is 169341129.

It is a happy number.

921143961 is a `hidden beast` number, since 9 + 211 + 439 + 6 + 1 = 666.

It is not a de Polignac number, because 921143961 - 2⁹ = 921143449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921143911) 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 15 ways as a sum of consecutive naturals, for example, 34776 + ... + 55241.

It is an arithmetic number, because the mean of its divisors is an integer number (85517100).

Almost surely, 2^921143961 is an apocalyptic number.

It is an amenable number.

921143961 is a deficient number, since it is larger than the sum of its proper divisors (447129639).

921143961 is a wasteful number, since it uses less digits than its factorization.

921143961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90405 (or 90399 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 921143961 is about 30350.3535564250. The cubic root of 921143961 is about 972.9917765283.

The spelling of 921143961 in words is "nine hundred twenty-one million, one hundred forty-three thousand, nine hundred sixty-one".