291021042 has 24 divisors (see below), whose sum is σ = 630260784. Its totient is φ = 89544624.

The previous prime is 291021023. The next prime is 291021083. The reversal of 291021042 is 240120192.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142488 + ... + 144515.

It is an arithmetic number, because the mean of its divisors is an integer number (26260866).

Almost surely, 2^291021042 is an apocalyptic number.

291021042 is an abundant number, since it is smaller than the sum of its proper divisors (339239742).

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

291021042 is a wasteful number, since it uses less digits than its factorization.

291021042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287034 (or 287021 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 291021042 is about 17059.3388500258. The cubic root of 291021042 is about 662.6865107722.

The spelling of 291021042 in words is "two hundred ninety-one million, twenty-one thousand, forty-two".