1626540121 has 2 divisors, whose sum is σ = 1626540122. Its totient is φ = 1626540120.

The previous prime is 1626540109. The next prime is 1626540169. The reversal of 1626540121 is 1210456261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1487182096 + 139358025 = 38564^2 + 11805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626540121 - 2¹⁷ = 1626409049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1626540121.

It is not a weakly prime, because it can be changed into another prime (1626540101) 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, 813270060 + 813270061.

It is an arithmetic number, because the mean of its divisors is an integer number (813270061).

Almost surely, 2^1626540121 is an apocalyptic number.

It is an amenable number.

1626540121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626540121 is an equidigital number, since it uses as much as digits as its factorization.

1626540121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1626540121 is about 40330.3870673218. The cubic root of 1626540121 is about 1176.0386460625.

Adding to 1626540121 its reverse (1210456261), we get a palindrome (2836996382).

The spelling of 1626540121 in words is "one billion, six hundred twenty-six million, five hundred forty thousand, one hundred twenty-one".