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231222011 is a prime number
BaseRepresentation
bin11011100100000…
…10101011111011
3121010002021222012
431302002223323
5433143101021
634535520135
75505232436
oct1562025373
9533067865
10231222011
11109578579
126552904b
1338b99577
14229cc81d
151547535b
hexdc82afb

231222011 has 2 divisors, whose sum is σ = 231222012. Its totient is φ = 231222010.

The previous prime is 231221983. The next prime is 231222023. The reversal of 231222011 is 110222132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231222011 - 210 = 231220987 is a prime.

It is not a weakly prime, because it can be changed into another prime (231222031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611005 + 115611006.

It is an arithmetic number, because the mean of its divisors is an integer number (115611006).

Almost surely, 2231222011 is an apocalyptic number.

231222011 is a deficient number, since it is larger than the sum of its proper divisors (1).

231222011 is an equidigital number, since it uses as much as digits as its factorization.

231222011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 231222011 is about 15205.9860252468. The cubic root of 231222011 is about 613.7757486194.

Adding to 231222011 its reverse (110222132), we get a palindrome (341444143).

It can be divided in two parts, 23 and 1222011, that multiplied together give a triangular number (28106253 = T7497).

The spelling of 231222011 in words is "two hundred thirty-one million, two hundred twenty-two thousand, eleven".