291216462020 has 108 divisors (see below), whose sum is σ = 694593661356. Its totient is φ = 102480048000.

The previous prime is 291216462001. The next prime is 291216462029. The reversal of 291216462020 is 20264612192.

It can be written as a sum of positive squares in 2 ways, for example, as 143786572864 + 147429889156 = 379192^2 + 383966^2 .

It is a super-2 number, since 2×291216462020² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (291216462029) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2263010 + ... + 2388230.

Almost surely, 2^291216462020 is an apocalyptic number.

291216462020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291216462020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347296830678).

291216462020 is an abundant number, since it is smaller than the sum of its proper divisors (403377199336).

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

291216462020 is a wasteful number, since it uses less digits than its factorization.

291216462020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125314 (or 125270 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 291216462020 in words is "two hundred ninety-one billion, two hundred sixteen million, four hundred sixty-two thousand, twenty".