291148240 has 40 divisors (see below), whose sum is σ = 679284648. Its totient is φ = 116052480.

The previous prime is 291148219. The next prime is 291148241. The reversal of 291148240 is 42841192.

It can be written as a sum of positive squares in 4 ways, for example, as 178703424 + 112444816 = 13368^2 + 10604^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291148241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17230 + ... + 29650.

Almost surely, 2^291148240 is an apocalyptic number.

291148240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291148240 is an abundant number, since it is smaller than the sum of its proper divisors (388136408).

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

291148240 is a wasteful number, since it uses less digits than its factorization.

291148240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12727 (or 12721 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 291148240 is about 17063.0665473707. The cubic root of 291148240 is about 662.7830445950.

The spelling of 291148240 in words is "two hundred ninety-one million, one hundred forty-eight thousand, two hundred forty".