126521445331 has 4 divisors (see below), whose sum is σ = 127517677312. Its totient is φ = 125525213352.

The previous prime is 126521445319. The next prime is 126521445359. The reversal of 126521445331 is 133544125621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126521445331 is a prime.

It is a super-2 number, since 2×126521445331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126521445301) 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 3 ways as a sum of consecutive naturals, for example, 498115800 + ... + 498116053.

It is an arithmetic number, because the mean of its divisors is an integer number (31879419328).

Almost surely, 2^126521445331 is an apocalyptic number.

126521445331 is a deficient number, since it is larger than the sum of its proper divisors (996231981).

126521445331 is an equidigital number, since it uses as much as digits as its factorization.

126521445331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996231980.

The product of its digits is 86400, while the sum is 37.

The spelling of 126521445331 in words is "one hundred twenty-six billion, five hundred twenty-one million, four hundred forty-five thousand, three hundred thirty-one".