2231521861 has 12 divisors (see below), whose sum is σ = 2357286624. Its totient is φ = 2112157800.

The previous prime is 2231521849. The next prime is 2231521871. The reversal of 2231521861 is 1681251322.

It is not a de Polignac number, because 2231521861 - 2²¹ = 2229424709 is a prime.

It is a super-3 number, since 3×2231521861³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231521811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 543426 + ... + 547516.

It is an arithmetic number, because the mean of its divisors is an integer number (196440552).

Almost surely, 2^2231521861 is an apocalyptic number.

It is an amenable number.

2231521861 is a deficient number, since it is larger than the sum of its proper divisors (125764763).

2231521861 is a wasteful number, since it uses less digits than its factorization.

2231521861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640 (or 5621 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 2231521861 is about 47238.9866635600. The cubic root of 2231521861 is about 1306.7736897436.

The spelling of 2231521861 in words is "two billion, two hundred thirty-one million, five hundred twenty-one thousand, eight hundred sixty-one".