126569491 has 2 divisors, whose sum is σ = 126569492. Its totient is φ = 126569490.

The previous prime is 126569453. The next prime is 126569519. The reversal of 126569491 is 194965621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126569491 - 2⁷ = 126569363 is a prime.

It is not a weakly prime, because it can be changed into another prime (126569411) 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, 63284745 + 63284746.

It is an arithmetic number, because the mean of its divisors is an integer number (63284746).

Almost surely, 2^126569491 is an apocalyptic number.

126569491 is a deficient number, since it is larger than the sum of its proper divisors (1).

126569491 is an equidigital number, since it uses as much as digits as its factorization.

126569491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 126569491 is about 11250.3107068205. The cubic root of 126569491 is about 502.0839568472.

It can be divided in two parts, 1265 and 69491, that added together give a square (70756 = 266²).

The spelling of 126569491 in words is "one hundred twenty-six million, five hundred sixty-nine thousand, four hundred ninety-one".