2215349781 has 8 divisors (see below), whose sum is σ = 3127552704. Its totient is φ = 1390023360.

The previous prime is 2215349663. The next prime is 2215349797. The reversal of 2215349781 is 1879435122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2215349781 - 2²⁵ = 2181795349 is a prime.

It is a super-2 number, since 2×2215349781² = 9815549304353495922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215348781) 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, 21719065 + ... + 21719166.

It is an arithmetic number, because the mean of its divisors is an integer number (390944088).

Almost surely, 2^2215349781 is an apocalyptic number.

It is an amenable number.

2215349781 is a deficient number, since it is larger than the sum of its proper divisors (912202923).

2215349781 is a wasteful number, since it uses less digits than its factorization.

2215349781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43438251.

The product of its digits is 120960, while the sum is 42.

The square root of 2215349781 is about 47067.5023875285. The cubic root of 2215349781 is about 1303.6092563571.

The spelling of 2215349781 in words is "two billion, two hundred fifteen million, three hundred forty-nine thousand, seven hundred eighty-one".