501121501 has 2 divisors, whose sum is σ = 501121502. Its totient is φ = 501121500.

The previous prime is 501121459. The next prime is 501121507. The reversal of 501121501 is 105121105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500595876 + 525625 = 22374^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 501121501 - 2¹³ = 501113309 is a prime.

It is a super-2 number, since 2×501121501² = 502245517528986002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501121507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250560750 + 250560751.

It is an arithmetic number, because the mean of its divisors is an integer number (250560751).

Almost surely, 2^501121501 is an apocalyptic number.

It is an amenable number.

501121501 is a deficient number, since it is larger than the sum of its proper divisors (1).

501121501 is an equidigital number, since it uses as much as digits as its factorization.

501121501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 501121501 is about 22385.7432532404. The cubic root of 501121501 is about 794.2935068082.

Adding to 501121501 its reverse (105121105), we get a palindrome (606242606).

The spelling of 501121501 in words is "five hundred one million, one hundred twenty-one thousand, five hundred one".