229420981 has 2 divisors, whose sum is σ = 229420982. Its totient is φ = 229420980.

The previous prime is 229420973. The next prime is 229420993. The reversal of 229420981 is 189024922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159012100 + 70408881 = 12610^2 + 8391^2 .

It is a cyclic number.

It is not a de Polignac number, because 229420981 - 2³ = 229420973 is a prime.

It is a super-2 number, since 2×229420981² = 105267973046004722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 229420981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229420901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114710490 + 114710491.

It is an arithmetic number, because the mean of its divisors is an integer number (114710491).

Almost surely, 2^229420981 is an apocalyptic number.

It is an amenable number.

229420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

229420981 is an equidigital number, since it uses as much as digits as its factorization.

229420981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 229420981 is about 15146.6491673901. The cubic root of 229420981 is about 612.1779896170.

The spelling of 229420981 in words is "two hundred twenty-nine million, four hundred twenty thousand, nine hundred eighty-one".