134128621 has 6 divisors (see below), whose sum is σ = 147430766. Its totient is φ = 121935000.

The previous prime is 134128601. The next prime is 134128633. The reversal of 134128621 is 126821431.

It can be written as a sum of positive squares in only one way, i.e., 133148521 + 980100 = 11539^2 + 990^2 .

It is a de Polignac number, because none of the positive numbers 2^k-134128621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 134128621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134128601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554130 + ... + 554371.

Almost surely, 2^134128621 is an apocalyptic number.

134128621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

134128621 is a deficient number, since it is larger than the sum of its proper divisors (13302145).

134128621 is a wasteful number, since it uses less digits than its factorization.

134128621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108523 (or 1108512 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 134128621 is about 11581.3911513255. The cubic root of 134128621 is about 511.8866695066.

The spelling of 134128621 in words is "one hundred thirty-four million, one hundred twenty-eight thousand, six hundred twenty-one".