126309281 has 12 divisors (see below), whose sum is σ = 145447488. Its totient is φ = 107450472.

The previous prime is 126309277. The next prime is 126309299. The reversal of 126309281 is 182903621.

It is not a de Polignac number, because 126309281 - 2² = 126309277 is a prime.

It is a super-2 number, since 2×126309281² = 31908068933473922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126309241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194900 + ... + 195546.

It is an arithmetic number, because the mean of its divisors is an integer number (12120624).

Almost surely, 2^126309281 is an apocalyptic number.

It is an amenable number.

126309281 is a deficient number, since it is larger than the sum of its proper divisors (19138207).

126309281 is an frugal number, since it uses more digits than its factorization.

126309281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 126309281 is about 11238.7401874053. The cubic root of 126309281 is about 501.7396482283.

The spelling of 126309281 in words is "one hundred twenty-six million, three hundred nine thousand, two hundred eighty-one".