126550981 has 2 divisors, whose sum is σ = 126550982. Its totient is φ = 126550980.

The previous prime is 126550967. The next prime is 126550987. The reversal of 126550981 is 189055621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 58752225 = 8234^2 + 7665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126550981 is a prime.

It is a super-2 number, since 2×126550981² = 32030301584124722, 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 126550981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126550987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63275490 + 63275491.

It is an arithmetic number, because the mean of its divisors is an integer number (63275491).

Almost surely, 2^126550981 is an apocalyptic number.

It is an amenable number.

126550981 is a deficient number, since it is larger than the sum of its proper divisors (1).

126550981 is an equidigital number, since it uses as much as digits as its factorization.

126550981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 126550981 is about 11249.4880327951. The cubic root of 126550981 is about 502.0594801031.

The spelling of 126550981 in words is "one hundred twenty-six million, five hundred fifty thousand, nine hundred eighty-one".