126367981 has 2 divisors, whose sum is σ = 126367982. Its totient is φ = 126367980.

The previous prime is 126367973. The next prime is 126368017. The reversal of 126367981 is 189763621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113081956 + 13286025 = 10634^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 126367981 - 2³ = 126367973 is a prime.

It is a super-2 number, since 2×126367981² = 31937733244032722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126367931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63183990 + 63183991.

It is an arithmetic number, because the mean of its divisors is an integer number (63183991).

Almost surely, 2^126367981 is an apocalyptic number.

It is an amenable number.

126367981 is a deficient number, since it is larger than the sum of its proper divisors (1).

126367981 is an equidigital number, since it uses as much as digits as its factorization.

126367981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 126367981 is about 11241.3513867328. The cubic root of 126367981 is about 501.8173610610.

The spelling of 126367981 in words is "one hundred twenty-six million, three hundred sixty-seven thousand, nine hundred eighty-one".