291606061 has 2 divisors, whose sum is σ = 291606062. Its totient is φ = 291606060.

The previous prime is 291606037. The next prime is 291606101. The reversal of 291606061 is 160606192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160503561 + 131102500 = 12669^2 + 11450^2 .

It is a cyclic number.

It is not a de Polignac number, because 291606061 - 2¹⁹ = 291081773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291606031) 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, 145803030 + 145803031.

It is an arithmetic number, because the mean of its divisors is an integer number (145803031).

Almost surely, 2^291606061 is an apocalyptic number.

It is an amenable number.

291606061 is a deficient number, since it is larger than the sum of its proper divisors (1).

291606061 is an equidigital number, since it uses as much as digits as its factorization.

291606061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 291606061 is about 17076.4768321806. The cubic root of 291606061 is about 663.1302641504.

The spelling of 291606061 in words is "two hundred ninety-one million, six hundred six thousand, sixty-one".