2016515261 has 4 divisors (see below), whose sum is σ = 2086050300. Its totient is φ = 1946980224.

The previous prime is 2016515257. The next prime is 2016515269. The reversal of 2016515261 is 1625156102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 402002500 + 1614512761 = 20050^2 + 40181^2 .

It is a cyclic number.

It is not a de Polignac number, because 2016515261 - 2² = 2016515257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 69535009 = 2016515261 / (2 + 0 + 1 + 6 + 5 + 1 + 5 + 2 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2016515269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34767476 + ... + 34767533.

It is an arithmetic number, because the mean of its divisors is an integer number (521512575).

Almost surely, 2^2016515261 is an apocalyptic number.

It is an amenable number.

2016515261 is a deficient number, since it is larger than the sum of its proper divisors (69535039).

2016515261 is an equidigital number, since it uses as much as digits as its factorization.

2016515261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69535038.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2016515261 is about 44905.6261619855. The cubic root of 2016515261 is about 1263.3795351572.

The spelling of 2016515261 in words is "two billion, sixteen million, five hundred fifteen thousand, two hundred sixty-one".