291016390 has 48 divisors (see below), whose sum is σ = 611734032. Its totient is φ = 99387456.

The previous prime is 291016381. The next prime is 291016391. The reversal of 291016390 is 93610192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291016391) 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 in 23 ways as a sum of consecutive naturals, for example, 142557 + ... + 144583.

It is an arithmetic number, because the mean of its divisors is an integer number (12744459).

Almost surely, 2^291016390 is an apocalyptic number.

291016390 is an abundant number, since it is smaller than the sum of its proper divisors (320717642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

291016390 is a wasteful number, since it uses less digits than its factorization.

291016390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 291016390 is about 17059.2025018756. The cubic root of 291016390 is about 662.6829797170.

The spelling of 291016390 in words is "two hundred ninety-one million, sixteen thousand, three hundred ninety".