126539869 has 2 divisors, whose sum is σ = 126539870. Its totient is φ = 126539868.

The previous prime is 126539863. The next prime is 126539873. The reversal of 126539869 is 968935621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64995844 + 61544025 = 8062^2 + 7845^2 .

It is a cyclic number.

It is not a de Polignac number, because 126539869 - 2¹⁷ = 126408797 is a prime.

It is a super-2 number, since 2×126539869² = 32024676893074322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126539863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63269934 + 63269935.

It is an arithmetic number, because the mean of its divisors is an integer number (63269935).

Almost surely, 2^126539869 is an apocalyptic number.

It is an amenable number.

126539869 is a deficient number, since it is larger than the sum of its proper divisors (1).

126539869 is an equidigital number, since it uses as much as digits as its factorization.

126539869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 126539869 is about 11248.9941328103. The cubic root of 126539869 is about 502.0447849761.

It can be divided in two parts, 12653 and 9869, that added together give a palindrome (22522).

The spelling of 126539869 in words is "one hundred twenty-six million, five hundred thirty-nine thousand, eight hundred sixty-nine".