239411981 has 2 divisors, whose sum is σ = 239411982. Its totient is φ = 239411980.

The previous prime is 239411959. The next prime is 239411987. The reversal of 239411981 is 189114932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178649956 + 60762025 = 13366^2 + 7795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239411981 is a prime.

It is a super-2 number, since 2×239411981² = 114636193292688722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239411987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119705990 + 119705991.

It is an arithmetic number, because the mean of its divisors is an integer number (119705991).

Almost surely, 2^239411981 is an apocalyptic number.

It is an amenable number.

239411981 is a deficient number, since it is larger than the sum of its proper divisors (1).

239411981 is an equidigital number, since it uses as much as digits as its factorization.

239411981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 239411981 is about 15472.9435144060. The cubic root of 239411981 is about 620.9385550867.

The spelling of 239411981 in words is "two hundred thirty-nine million, four hundred eleven thousand, nine hundred eighty-one".