921191948 has 6 divisors (see below), whose sum is σ = 1612085916. Its totient is φ = 460595972.

The previous prime is 921191941. The next prime is 921191969. The reversal of 921191948 is 849191129.

It is a junction number, because it is equal to n+sod(n) for n = 921191899 and 921191908.

It is not an unprimeable number, because it can be changed into a prime (921191941) 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 as a sum of consecutive naturals, namely, 115148990 + ... + 115148997.

It is an arithmetic number, because the mean of its divisors is an integer number (268680986).

Almost surely, 2^921191948 is an apocalyptic number.

It is an amenable number.

921191948 is a deficient number, since it is larger than the sum of its proper divisors (690893968).

921191948 is a wasteful number, since it uses less digits than its factorization.

921191948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230297991 (or 230297989 counting only the distinct ones).

The product of its digits is 46656, while the sum is 44.

The square root of 921191948 is about 30351.1440970518. The cubic root of 921191948 is about 973.0086722390.

The spelling of 921191948 in words is "nine hundred twenty-one million, one hundred ninety-one thousand, nine hundred forty-eight".