501454991 has 2 divisors, whose sum is σ = 501454992. Its totient is φ = 501454990.

The previous prime is 501454981. The next prime is 501455021. The reversal of 501454991 is 199454105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501454991 - 2⁶ = 501454927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501454981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250727495 + 250727496.

It is an arithmetic number, because the mean of its divisors is an integer number (250727496).

Almost surely, 2^501454991 is an apocalyptic number.

501454991 is a deficient number, since it is larger than the sum of its proper divisors (1).

501454991 is an equidigital number, since it uses as much as digits as its factorization.

501454991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 501454991 is about 22393.1907284335. The cubic root of 501454991 is about 794.4696651535.

The spelling of 501454991 in words is "five hundred one million, four hundred fifty-four thousand, nine hundred ninety-one".