1921521546 has 96 divisors (see below), whose sum is σ = 4971552768. Its totient is φ = 524806560.

The previous prime is 1921521541. The next prime is 1921521559. The reversal of 1921521546 is 6451251291.

1921521546 is a `hidden beast` number, since 1 + 92 + 1 + 5 + 21 + 546 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921521546.

It is not an unprimeable number, because it can be changed into a prime (1921521541) 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 in 47 ways as a sum of consecutive naturals, for example, 321235 + ... + 327161.

It is an arithmetic number, because the mean of its divisors is an integer number (51787008).

Almost surely, 2^1921521546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921521546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2485776384).

1921521546 is an abundant number, since it is smaller than the sum of its proper divisors (3050031222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921521546 is a wasteful number, since it uses less digits than its factorization.

1921521546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6056 (or 6053 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1921521546 is about 43835.1633508990. The cubic root of 1921521546 is about 1243.2212349411.

The spelling of 1921521546 in words is "one billion, nine hundred twenty-one million, five hundred twenty-one thousand, five hundred forty-six".