620545531 has 2 divisors, whose sum is σ = 620545532. Its totient is φ = 620545530.

The previous prime is 620545517. The next prime is 620545561. The reversal of 620545531 is 135545026.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620545531 is a prime.

It is a super-2 number, since 2×620545531² = 770153512088143922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 620545493 and 620545502.

It is not a weakly prime, because it can be changed into another prime (620545511) 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, 310272765 + 310272766.

It is an arithmetic number, because the mean of its divisors is an integer number (310272766).

Almost surely, 2^620545531 is an apocalyptic number.

620545531 is a deficient number, since it is larger than the sum of its proper divisors (1).

620545531 is an equidigital number, since it uses as much as digits as its factorization.

620545531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 620545531 is about 24910.7513134389. The cubic root of 620545531 is about 852.9519192700.

The spelling of 620545531 in words is "six hundred twenty million, five hundred forty-five thousand, five hundred thirty-one".