291278051 has 12 divisors (see below), whose sum is σ = 310718376. Its totient is φ = 272108160.

The previous prime is 291277993. The next prime is 291278069. The reversal of 291278051 is 150872192.

It is not a de Polignac number, because 291278051 - 2¹⁰ = 291277027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291278951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 556676 + ... + 557198.

It is an arithmetic number, because the mean of its divisors is an integer number (25893198).

Almost surely, 2^291278051 is an apocalyptic number.

291278051 is a deficient number, since it is larger than the sum of its proper divisors (19440325).

291278051 is an equidigital number, since it uses as much as digits as its factorization.

291278051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 291278051 is about 17066.8699825129. The cubic root of 291278051 is about 662.8815325064.

The spelling of 291278051 in words is "two hundred ninety-one million, two hundred seventy-eight thousand, fifty-one".