921148990 has 8 divisors (see below), whose sum is σ = 1658068200. Its totient is φ = 368459592.

The previous prime is 921148981. The next prime is 921149017. The reversal of 921148990 is 99841129.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46057440 + ... + 46057459.

It is an arithmetic number, because the mean of its divisors is an integer number (207258525).

Almost surely, 2^921148990 is an apocalyptic number.

921148990 is a deficient number, since it is larger than the sum of its proper divisors (736919210).

921148990 is a wasteful number, since it uses less digits than its factorization.

921148990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92114906.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 921148990 is about 30350.4364054292. The cubic root of 921148990 is about 972.9935472131.

The spelling of 921148990 in words is "nine hundred twenty-one million, one hundred forty-eight thousand, nine hundred ninety".