126156121 has 16 divisors (see below), whose sum is σ = 156314368. Its totient is φ = 99144000.

The previous prime is 126156091. The next prime is 126156193. The reversal of 126156121 is 121651621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 126156121 - 2⁷ = 126155993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126156721) 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, 9151 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (9769648).

Almost surely, 2^126156121 is an apocalyptic number.

It is an amenable number.

126156121 is a deficient number, since it is larger than the sum of its proper divisors (30158247).

126156121 is a wasteful number, since it uses less digits than its factorization.

126156121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352.

The product of its digits is 720, while the sum is 25.

The square root of 126156121 is about 11231.9241895590. The cubic root of 126156121 is about 501.5367665249.

The spelling of 126156121 in words is "one hundred twenty-six million, one hundred fifty-six thousand, one hundred twenty-one".