1521730889 has 8 divisors (see below), whose sum is σ = 1741245888. Its totient is φ = 1302747120.

The previous prime is 1521730871. The next prime is 1521730897. The reversal of 1521730889 is 9880371251.

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 1521730889 - 2²⁰ = 1520682313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521730289) 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, 126647 + ... + 138140.

It is an arithmetic number, because the mean of its divisors is an integer number (217655736).

Almost surely, 2^1521730889 is an apocalyptic number.

It is an amenable number.

1521730889 is a deficient number, since it is larger than the sum of its proper divisors (219514999).

1521730889 is an equidigital number, since it uses as much as digits as its factorization.

1521730889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265615.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1521730889 is about 39009.3692463746. The cubic root of 1521730889 is about 1150.2156845612.

The spelling of 1521730889 in words is "one billion, five hundred twenty-one million, seven hundred thirty thousand, eight hundred eighty-nine".