291321645340 has 48 divisors (see below), whose sum is σ = 667456433280. Its totient is φ = 105924822080.

The previous prime is 291321645157. The next prime is 291321645347. The reversal of 291321645340 is 43546123192.

It is a junction number, because it is equal to n+sod(n) for n = 291321645293 and 291321645302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291321645347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2414571 + ... + 2532349.

It is an arithmetic number, because the mean of its divisors is an integer number (13905342360).

Almost surely, 2^291321645340 is an apocalyptic number.

291321645340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291321645340 is an abundant number, since it is smaller than the sum of its proper divisors (376134787940).

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

291321645340 is a wasteful number, since it uses less digits than its factorization.

291321645340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129042 (or 129040 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 291321645340 in words is "two hundred ninety-one billion, three hundred twenty-one million, six hundred forty-five thousand, three hundred forty".