229877781 has 16 divisors (see below), whose sum is σ = 359758464. Its totient is φ = 127808064.

The previous prime is 229877779. The next prime is 229877807. The reversal of 229877781 is 187778922.

It is a happy number.

229877781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 229877781 - 2¹ = 229877779 is a prime.

It is a super-2 number, since 2×229877781² = 105687588394967922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229877701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147150 + ... + 148703.

It is an arithmetic number, because the mean of its divisors is an integer number (22484904).

Almost surely, 2^229877781 is an apocalyptic number.

229877781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

229877781 is a deficient number, since it is larger than the sum of its proper divisors (129880683).

229877781 is a wasteful number, since it uses less digits than its factorization.

229877781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295900.

The product of its digits is 790272, while the sum is 51.

The square root of 229877781 is about 15161.7209115588. The cubic root of 229877781 is about 612.5840226812.

The spelling of 229877781 in words is "two hundred twenty-nine million, eight hundred seventy-seven thousand, seven hundred eighty-one".