2809155261 has 8 divisors (see below), whose sum is σ = 4086044064. Its totient is φ = 1702518320.

The previous prime is 2809155197. The next prime is 2809155269. The reversal of 2809155261 is 1625519082.

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 2809155261 - 2⁶ = 2809155197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809155269) 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, 42562926 + ... + 42562991.

It is an arithmetic number, because the mean of its divisors is an integer number (510755508).

Almost surely, 2^2809155261 is an apocalyptic number.

It is an amenable number.

2809155261 is a deficient number, since it is larger than the sum of its proper divisors (1276888803).

2809155261 is a wasteful number, since it uses less digits than its factorization.

2809155261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85125931.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 2809155261 is about 53001.4647061758. The cubic root of 2809155261 is about 1410.9942622637.

The spelling of 2809155261 in words is "two billion, eight hundred nine million, one hundred fifty-five thousand, two hundred sixty-one".