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2215244981 is a prime number
BaseRepresentation
bin1000010000001001…
…1111010010110101
312201101101002211102
42010002133102311
514014100314411
61003452215445
7105616162115
oct20402372265
95641332742
102215244981
11a374a2384
12519a6a585
13293c3b661
141702c9045
15ce72dd3b
hex8409f4b5

2215244981 has 2 divisors, whose sum is σ = 2215244982. Its totient is φ = 2215244980.

The previous prime is 2215244971. The next prime is 2215245001. The reversal of 2215244981 is 1894425122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1608411025 + 606833956 = 40105^2 + 24634^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215244981 - 210 = 2215243957 is a prime.

It is a super-2 number, since 2×22152449812 = 9814620651691380722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215244971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107622490 + 1107622491.

It is an arithmetic number, because the mean of its divisors is an integer number (1107622491).

Almost surely, 22215244981 is an apocalyptic number.

It is an amenable number.

2215244981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215244981 is an equidigital number, since it uses as much as digits as its factorization.

2215244981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 2215244981 is about 47066.3890796819. The cubic root of 2215244981 is about 1303.5886997230.

The spelling of 2215244981 in words is "two billion, two hundred fifteen million, two hundred forty-four thousand, nine hundred eighty-one".