127121813 has 16 divisors (see below), whose sum is σ = 159116160. Its totient is φ = 98870976.

The previous prime is 127121809. The next prime is 127121821. The reversal of 127121813 is 318121721.

It is a cyclic number.

It is not a de Polignac number, because 127121813 - 2² = 127121809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127121833) 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, 6470 + ... + 17207.

It is an arithmetic number, because the mean of its divisors is an integer number (9944760).

Almost surely, 2^127121813 is an apocalyptic number.

127121813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

127121813 is a deficient number, since it is larger than the sum of its proper divisors (31994347).

127121813 is a wasteful number, since it uses less digits than its factorization.

127121813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23756.

The product of its digits is 672, while the sum is 26.

The square root of 127121813 is about 11274.8309521695. The cubic root of 127121813 is about 502.8132258347.

The spelling of 127121813 in words is "one hundred twenty-seven million, one hundred twenty-one thousand, eight hundred thirteen".