612136121 has 4 divisors (see below), whose sum is σ = 614697600. Its totient is φ = 609574644.

The previous prime is 612136097. The next prime is 612136141. The reversal of 612136121 is 121631216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612136121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612136141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280381 + ... + 1280858.

It is an arithmetic number, because the mean of its divisors is an integer number (153674400).

Almost surely, 2^612136121 is an apocalyptic number.

It is an amenable number.

612136121 is a deficient number, since it is larger than the sum of its proper divisors (2561479).

612136121 is a wasteful number, since it uses less digits than its factorization.

612136121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561478.

The product of its digits is 432, while the sum is 23.

The square root of 612136121 is about 24741.3847833948. The cubic root of 612136121 is about 849.0814164225.

Adding to 612136121 its reverse (121631216), we get a palindrome (733767337).

The spelling of 612136121 in words is "six hundred twelve million, one hundred thirty-six thousand, one hundred twenty-one".