1921520161 has 8 divisors (see below), whose sum is σ = 2096522784. Its totient is φ = 1746570720.

The previous prime is 1921520147. The next prime is 1921520171. The reversal of 1921520161 is 1610251291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921520161 - 2¹¹ = 1921518113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921520101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123526 + ... + 138208.

It is an arithmetic number, because the mean of its divisors is an integer number (262065348).

Almost surely, 2^1921520161 is an apocalyptic number.

1921520161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1921520161 is a deficient number, since it is larger than the sum of its proper divisors (175002623).

1921520161 is a wasteful number, since it uses less digits than its factorization.

1921520161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26591.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1921520161 is about 43835.1475530766. The cubic root of 1921520161 is about 1243.2209362435.

The spelling of 1921520161 in words is "one billion, nine hundred twenty-one million, five hundred twenty thousand, one hundred sixty-one".