501888649 has 2 divisors, whose sum is σ = 501888650. Its totient is φ = 501888648.

The previous prime is 501888643. The next prime is 501888689. The reversal of 501888649 is 946888105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392832400 + 109056249 = 19820^2 + 10443^2 .

It is a cyclic number.

It is not a de Polignac number, because 501888649 - 2⁷ = 501888521 is a prime.

It is equal to p_26449969 and since 501888649 and 26449969 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (501888643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250944324 + 250944325.

It is an arithmetic number, because the mean of its divisors is an integer number (250944325).

Almost surely, 2^501888649 is an apocalyptic number.

It is an amenable number.

501888649 is a deficient number, since it is larger than the sum of its proper divisors (1).

501888649 is an equidigital number, since it uses as much as digits as its factorization.

501888649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 501888649 is about 22402.8714454197. The cubic root of 501888649 is about 794.6986181429.

The spelling of 501888649 in words is "five hundred one million, eight hundred eighty-eight thousand, six hundred forty-nine".