612291 has 8 divisors (see below), whose sum is σ = 826560. Its totient is φ = 403112.

The previous prime is 612263. The next prime is 612301. The reversal of 612291 is 192216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612291 - 2⁵ = 612259 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (612791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (103320).

2⁶¹²²⁹¹ is an apocalyptic number.

612291 is a deficient number, since it is larger than the sum of its proper divisors (214269).

612291 is a wasteful number, since it uses less digits than its factorization.

612291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545.

The product of its digits is 216, while the sum is 21.

The square root of 612291 is about 782.4902555304. The cubic root of 612291 is about 84.9153020209.

It can be divided in two parts, 612 and 291, that added together give a triangular number (903 = T₄₂).

The spelling of 612291 in words is "six hundred twelve thousand, two hundred ninety-one".