291145951 has 2 divisors, whose sum is σ = 291145952. Its totient is φ = 291145950.

The previous prime is 291145931. The next prime is 291145979. The reversal of 291145951 is 159541192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291145951 - 2¹¹ = 291143903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291145951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291145931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145572975 + 145572976.

It is an arithmetic number, because the mean of its divisors is an integer number (145572976).

Almost surely, 2^291145951 is an apocalyptic number.

291145951 is a deficient number, since it is larger than the sum of its proper divisors (1).

291145951 is an equidigital number, since it uses as much as digits as its factorization.

291145951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 37.

The square root of 291145951 is about 17062.9994725429. Note that the first 3 decimals coincide. The cubic root of 291145951 is about 662.7813076626.

The spelling of 291145951 in words is "two hundred ninety-one million, one hundred forty-five thousand, nine hundred fifty-one".