1262551021 has 2 divisors, whose sum is σ = 1262551022. Its totient is φ = 1262551020.

The previous prime is 1262550997. The next prime is 1262551049. The reversal of 1262551021 is 1201552621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997675396 + 264875625 = 31586^2 + 16275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1262551021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1262551091) 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, 631275510 + 631275511.

It is an arithmetic number, because the mean of its divisors is an integer number (631275511).

Almost surely, 2^1262551021 is an apocalyptic number.

It is an amenable number.

1262551021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262551021 is an equidigital number, since it uses as much as digits as its factorization.

1262551021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1262551021 is about 35532.3939666328. The cubic root of 1262551021 is about 1080.8107255639.

The spelling of 1262551021 in words is "one billion, two hundred sixty-two million, five hundred fifty-one thousand, twenty-one".