291696947 has 2 divisors, whose sum is σ = 291696948. Its totient is φ = 291696946.

The previous prime is 291696917. The next prime is 291696973. The reversal of 291696947 is 749696192.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291696947 - 2⁶ = 291696883 is a prime.

It is not a weakly prime, because it can be changed into another prime (291696917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145848473 + 145848474.

It is an arithmetic number, because the mean of its divisors is an integer number (145848474).

Almost surely, 2^291696947 is an apocalyptic number.

291696947 is a deficient number, since it is larger than the sum of its proper divisors (1).

291696947 is an equidigital number, since it uses as much as digits as its factorization.

291696947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 291696947 is about 17079.1377709766. The cubic root of 291696947 is about 663.1991504607.

The spelling of 291696947 in words is "two hundred ninety-one million, six hundred ninety-six thousand, nine hundred forty-seven".