612331861 has 2 divisors, whose sum is σ = 612331862. Its totient is φ = 612331860.

The previous prime is 612331787. The next prime is 612331879. The reversal of 612331861 is 168133216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404251236 + 208080625 = 20106^2 + 14425^2 .

It is a cyclic number.

It is not a de Polignac number, because 612331861 - 2²⁵ = 578777429 is a prime.

It is a super-3 number, since 3×612331861³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612331061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306165930 + 306165931.

It is an arithmetic number, because the mean of its divisors is an integer number (306165931).

Almost surely, 2^612331861 is an apocalyptic number.

It is an amenable number.

612331861 is a deficient number, since it is larger than the sum of its proper divisors (1).

612331861 is an equidigital number, since it uses as much as digits as its factorization.

612331861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 612331861 is about 24745.3401875990. The cubic root of 612331861 is about 849.1719090864.

The spelling of 612331861 in words is "six hundred twelve million, three hundred thirty-one thousand, eight hundred sixty-one".