612655861 has 2 divisors, whose sum is σ = 612655862. Its totient is φ = 612655860.

The previous prime is 612655847. The next prime is 612655891. The reversal of 612655861 is 168556216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400400100 + 212255761 = 20010^2 + 14569^2 .

It is a cyclic number.

It is not a de Polignac number, because 612655861 - 2¹³ = 612647669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612655801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306327930 + 306327931.

It is an arithmetic number, because the mean of its divisors is an integer number (306327931).

Almost surely, 2^612655861 is an apocalyptic number.

It is an amenable number.

612655861 is a deficient number, since it is larger than the sum of its proper divisors (1).

612655861 is an equidigital number, since it uses as much as digits as its factorization.

612655861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 612655861 is about 24751.8860089489. The cubic root of 612655861 is about 849.3216553291.

The spelling of 612655861 in words is "six hundred twelve million, six hundred fifty-five thousand, eight hundred sixty-one".