291861052 has 72 divisors (see below), whose sum is σ = 630324240. Its totient is φ = 117573120.

The previous prime is 291861041. The next prime is 291861067. The reversal of 291861052 is 250168192.

It is a junction number, because it is equal to n+sod(n) for n = 291860999 and 291861017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673828 + ... + 674260.

Almost surely, 2^291861052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291861052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315162120).

291861052 is an abundant number, since it is smaller than the sum of its proper divisors (338463188).

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

291861052 is a wasteful number, since it uses less digits than its factorization.

291861052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 291861052 is about 17083.9413485296. The cubic root of 291861052 is about 663.3234962866.

The spelling of 291861052 in words is "two hundred ninety-one million, eight hundred sixty-one thousand, fifty-two".