921440061 has 12 divisors (see below), whose sum is σ = 1331808192. Its totient is φ = 613906056.

The previous prime is 921440057. The next prime is 921440071. The reversal of 921440061 is 160044129.

It is not a de Polignac number, because 921440061 - 2² = 921440057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921440011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16821 + ... + 46106.

It is an arithmetic number, because the mean of its divisors is an integer number (110984016).

Almost surely, 2^921440061 is an apocalyptic number.

It is an amenable number.

921440061 is a deficient number, since it is larger than the sum of its proper divisors (410368131).

921440061 is a wasteful number, since it uses less digits than its factorization.

921440061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64560 (or 64557 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 921440061 is about 30355.2311966158. The cubic root of 921440061 is about 973.0960208204.

The spelling of 921440061 in words is "nine hundred twenty-one million, four hundred forty thousand, sixty-one".