2187355261 has 16 divisors (see below), whose sum is σ = 2754742144. Its totient is φ = 1690403904.

The previous prime is 2187355253. The next prime is 2187355273. The reversal of 2187355261 is 1625537812.

It is not a de Polignac number, because 2187355261 - 2³ = 2187355253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187355241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275586 + ... + 283411.

It is an arithmetic number, because the mean of its divisors is an integer number (172171384).

Almost surely, 2^2187355261 is an apocalyptic number.

It is an amenable number.

2187355261 is a deficient number, since it is larger than the sum of its proper divisors (567386883).

2187355261 is a wasteful number, since it uses less digits than its factorization.

2187355261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559060.

The product of its digits is 100800, while the sum is 40.

The square root of 2187355261 is about 46769.1699840825. The cubic root of 2187355261 is about 1298.0948941111.

The spelling of 2187355261 in words is "two billion, one hundred eighty-seven million, three hundred fifty-five thousand, two hundred sixty-one".