1276498381 has 2 divisors, whose sum is σ = 1276498382. Its totient is φ = 1276498380.

The previous prime is 1276498357. The next prime is 1276498429. The reversal of 1276498381 is 1838946721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1054041156 + 222457225 = 32466^2 + 14915^2 .

It is an emirp because it is prime and its reverse (1838946721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1276498381 - 2¹⁵ = 1276465613 is a prime.

It is a super-2 number, since 2×1276498381² = 3258896233391242322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276498331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638249190 + 638249191.

It is an arithmetic number, because the mean of its divisors is an integer number (638249191).

Almost surely, 2^1276498381 is an apocalyptic number.

It is an amenable number.

1276498381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276498381 is an equidigital number, since it uses as much as digits as its factorization.

1276498381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 1276498381 is about 35728.1175126818. The cubic root of 1276498381 is about 1084.7760532229.

The spelling of 1276498381 in words is "one billion, two hundred seventy-six million, four hundred ninety-eight thousand, three hundred eighty-one".