612121894 has 4 divisors (see below), whose sum is σ = 918182844. Its totient is φ = 306060946.

The previous prime is 612121859. The next prime is 612121897. The reversal of 612121894 is 498121216.

It is a happy number.

612121894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×612121894² = 749386426228294472, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612121897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153030472 + ... + 153030475.

It is an arithmetic number, because the mean of its divisors is an integer number (229545711).

Almost surely, 2^612121894 is an apocalyptic number.

612121894 is a deficient number, since it is larger than the sum of its proper divisors (306060950).

612121894 is a wasteful number, since it uses less digits than its factorization.

612121894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306060949.

The product of its digits is 6912, while the sum is 34.

The square root of 612121894 is about 24741.0972675021. The cubic root of 612121894 is about 849.0748383786.

The spelling of 612121894 in words is "six hundred twelve million, one hundred twenty-one thousand, eight hundred ninety-four".