126521880969 has 16 divisors (see below), whose sum is σ = 189968338944. Its totient is φ = 74206381200.

The previous prime is 126521880967. The next prime is 126521880971. The reversal of 126521880969 is 969088125621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (126521880967) and next prime (126521880971).

It is not a de Polignac number, because 126521880969 - 2¹ = 126521880967 is a prime.

It is a super-2 number, since 2×126521880969² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (126521880967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61837629 + ... + 61839674.

It is an arithmetic number, because the mean of its divisors is an integer number (11873021184).

Almost surely, 2^126521880969 is an apocalyptic number.

It is an amenable number.

126521880969 is a deficient number, since it is larger than the sum of its proper divisors (63446457975).

126521880969 is a wasteful number, since it uses less digits than its factorization.

126521880969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123677348.

The product of its (nonzero) digits is 3732480, while the sum is 57.

It can be divided in two parts, 126521 and 880969, that added together give a triangular number (1007490 = T₁₄₁₉).

The spelling of 126521880969 in words is "one hundred twenty-six billion, five hundred twenty-one million, eight hundred eighty thousand, nine hundred sixty-nine".