126491577121 has 16 divisors (see below), whose sum is σ = 156273917184. Its totient is φ = 99700691904.

The previous prime is 126491577089. The next prime is 126491577127. The reversal of 126491577121 is 121775194621.

It is a cyclic number.

It is not a de Polignac number, because 126491577121 - 2⁵ = 126491577089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126491577127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2618686 + ... + 2666551.

It is an arithmetic number, because the mean of its divisors is an integer number (9767119824).

Almost surely, 2^126491577121 is an apocalyptic number.

It is an amenable number.

126491577121 is a deficient number, since it is larger than the sum of its proper divisors (29782340063).

126491577121 is a wasteful number, since it uses less digits than its factorization.

126491577121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285520.

The product of its digits is 211680, while the sum is 46.

The spelling of 126491577121 in words is "one hundred twenty-six billion, four hundred ninety-one million, five hundred seventy-seven thousand, one hundred twenty-one".