612051991 has 2 divisors, whose sum is σ = 612051992. Its totient is φ = 612051990.

The previous prime is 612051983. The next prime is 612052019. The reversal of 612051991 is 199150216.

It is a happy number.

612051991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 612051991 - 2³ = 612051983 is a prime.

It is equal to p_31920766 and since 612051991 and 31920766 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612051971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306025995 + 306025996.

It is an arithmetic number, because the mean of its divisors is an integer number (306025996).

Almost surely, 2^612051991 is an apocalyptic number.

612051991 is a deficient number, since it is larger than the sum of its proper divisors (1).

612051991 is an equidigital number, since it uses as much as digits as its factorization.

612051991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 612051991 is about 24739.6845371965. The cubic root of 612051991 is about 849.0425163098.

The spelling of 612051991 in words is "six hundred twelve million, fifty-one thousand, nine hundred ninety-one".