291942061 has 2 divisors, whose sum is σ = 291942062. Its totient is φ = 291942060.

The previous prime is 291942047. The next prime is 291942103. The reversal of 291942061 is 160249192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163686436 + 128255625 = 12794^2 + 11325^2 .

It is a cyclic number.

It is not a de Polignac number, because 291942061 - 2⁹ = 291941549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291942461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145971030 + 145971031.

It is an arithmetic number, because the mean of its divisors is an integer number (145971031).

Almost surely, 2^291942061 is an apocalyptic number.

It is an amenable number.

291942061 is a deficient number, since it is larger than the sum of its proper divisors (1).

291942061 is an equidigital number, since it uses as much as digits as its factorization.

291942061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 291942061 is about 17086.3120947734. The cubic root of 291942061 is about 663.3848613345.

The spelling of 291942061 in words is "two hundred ninety-one million, nine hundred forty-two thousand, sixty-one".