1251620063 has 2 divisors, whose sum is σ = 1251620064. Its totient is φ = 1251620062.

The previous prime is 1251620057. The next prime is 1251620093. The reversal of 1251620063 is 3600261521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251620063 - 2²⁸ = 983184607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251620023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625810031 + 625810032.

It is an arithmetic number, because the mean of its divisors is an integer number (625810032).

Almost surely, 2^1251620063 is an apocalyptic number.

1251620063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251620063 is an equidigital number, since it uses as much as digits as its factorization.

1251620063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1251620063 is about 35378.2427912976. The cubic root of 1251620063 is about 1077.6825201006.

Adding to 1251620063 its reverse (3600261521), we get a palindrome (4851881584).

The spelling of 1251620063 in words is "one billion, two hundred fifty-one million, six hundred twenty thousand, sixty-three".