126651181 has 2 divisors, whose sum is σ = 126651182. Its totient is φ = 126651180.

The previous prime is 126651167. The next prime is 126651199. The reversal of 126651181 is 181156621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72760900 + 53890281 = 8530^2 + 7341^2 .

It is a cyclic number.

It is not a de Polignac number, because 126651181 - 2¹⁷ = 126520109 is a prime.

It is a super-2 number, since 2×126651181² = 32081043297389522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126651121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63325590 + 63325591.

It is an arithmetic number, because the mean of its divisors is an integer number (63325591).

Almost surely, 2^126651181 is an apocalyptic number.

It is an amenable number.

126651181 is a deficient number, since it is larger than the sum of its proper divisors (1).

126651181 is an equidigital number, since it uses as much as digits as its factorization.

126651181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 126651181 is about 11253.9406875992. The cubic root of 126651181 is about 502.1919513234.

The spelling of 126651181 in words is "one hundred twenty-six million, six hundred fifty-one thousand, one hundred eighty-one".