291228956 has 24 divisors (see below), whose sum is σ = 519474480. Its totient is φ = 142819200.

The previous prime is 291228953. The next prime is 291229009. The reversal of 291228956 is 659822192.

It is a super-3 number, since 3×291228956³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291228953) 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, 126536 + ... + 128816.

It is an arithmetic number, because the mean of its divisors is an integer number (21644770).

Almost surely, 2^291228956 is an apocalyptic number.

It is an amenable number.

291228956 is a deficient number, since it is larger than the sum of its proper divisors (228245524).

291228956 is a wasteful number, since it uses less digits than its factorization.

291228956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885 (or 2883 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 291228956 is about 17065.4316089573. The cubic root of 291228956 is about 662.8442874556.

It can be divided in two parts, 291 and 228956, that multiplied together give a triangular number (66626196 = T₁₁₅₄₃).

The spelling of 291228956 in words is "two hundred ninety-one million, two hundred twenty-eight thousand, nine hundred fifty-six".