2091527521 has 6 divisors (see below), whose sum is σ = 2127581522. Its totient is φ = 2056074480.

The previous prime is 2091527519. The next prime is 2091527569. The reversal of 2091527521 is 1257251902.

It can be written as a sum of positive squares in only one way, i.e., 2069249121 + 22278400 = 45489^2 + 4720^2 .

It is not a de Polignac number, because 2091527521 - 2¹ = 2091527519 is a prime.

It is a super-2 number, since 2×2091527521² = 8748974742200810882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091527591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296940 + ... + 303901.

Almost surely, 2^2091527521 is an apocalyptic number.

It is an amenable number.

2091527521 is a deficient number, since it is larger than the sum of its proper divisors (36054001).

2091527521 is an frugal number, since it uses more digits than its factorization.

2091527521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600959 (or 600900 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 2091527521 is about 45733.2211964126. The cubic root of 2091527521 is about 1278.8546722991.

The spelling of 2091527521 in words is "two billion, ninety-one million, five hundred twenty-seven thousand, five hundred twenty-one".