501545531 has 2 divisors, whose sum is σ = 501545532. Its totient is φ = 501545530.

The previous prime is 501545467. The next prime is 501545533. The reversal of 501545531 is 135545105.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 501545531 - 2⁶ = 501545467 is a prime.

It is a super-2 number, since 2×501545531² = 503095839332143922, which contains 22 as substring.

Together with 501545533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 501545494 and 501545503.

It is not a weakly prime, because it can be changed into another prime (501545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250772765 + 250772766.

It is an arithmetic number, because the mean of its divisors is an integer number (250772766).

Almost surely, 2^501545531 is an apocalyptic number.

501545531 is a deficient number, since it is larger than the sum of its proper divisors (1).

501545531 is an equidigital number, since it uses as much as digits as its factorization.

501545531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 501545531 is about 22395.2122338682. The cubic root of 501545531 is about 794.5174773241.

The spelling of 501545531 in words is "five hundred one million, five hundred forty-five thousand, five hundred thirty-one".