1620122531 has 2 divisors, whose sum is σ = 1620122532. Its totient is φ = 1620122530.

The previous prime is 1620122509. The next prime is 1620122549. The reversal of 1620122531 is 1352210261.

It is a strong prime.

It is an emirp because it is prime and its reverse (1352210261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620122531 - 2²⁶ = 1553013667 is a prime.

It is a super-2 number, since 2×1620122531² = 5249594030907691922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1620122497 and 1620122506.

It is not a weakly prime, because it can be changed into another prime (1620122501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810061265 + 810061266.

It is an arithmetic number, because the mean of its divisors is an integer number (810061266).

Almost surely, 2^1620122531 is an apocalyptic number.

1620122531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620122531 is an equidigital number, since it uses as much as digits as its factorization.

1620122531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1620122531 is about 40250.7457198000. The cubic root of 1620122531 is about 1174.4899022614.

Adding to 1620122531 its reverse (1352210261), we get a palindrome (2972332792).

The spelling of 1620122531 in words is "one billion, six hundred twenty million, one hundred twenty-two thousand, five hundred thirty-one".