291008061 has 6 divisors (see below), whose sum is σ = 420344990. Its totient is φ = 194005368.

The previous prime is 291008059. The next prime is 291008083. The reversal of 291008061 is 160800192.

It can be written as a sum of positive squares in only one way, i.e., 253000836 + 38007225 = 15906^2 + 6165^2 .

It is not a de Polignac number, because 291008061 - 2¹ = 291008059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291008761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16167106 + ... + 16167123.

Almost surely, 2^291008061 is an apocalyptic number.

It is an amenable number.

291008061 is a deficient number, since it is larger than the sum of its proper divisors (129336929).

291008061 is a wasteful number, since it uses less digits than its factorization.

291008061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32334235 (or 32334232 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 291008061 is about 17058.9583796901. The cubic root of 291008061 is about 662.6766575769.

The spelling of 291008061 in words is "two hundred ninety-one million, eight thousand, sixty-one".