1356484781 has 2 divisors, whose sum is σ = 1356484782. Its totient is φ = 1356484780.

The previous prime is 1356484769. The next prime is 1356484897. The reversal of 1356484781 is 1874846531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1343882281 + 12602500 = 36659^2 + 3550^2 .

It is an emirp because it is prime and its reverse (1874846531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1356484781 - 2¹⁰ = 1356483757 is a prime.

It is a super-2 number, since 2×1356484781² = 3680101922169235922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1356484981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678242390 + 678242391.

It is an arithmetic number, because the mean of its divisors is an integer number (678242391).

Almost surely, 2^1356484781 is an apocalyptic number.

It is an amenable number.

1356484781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356484781 is an equidigital number, since it uses as much as digits as its factorization.

1356484781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 47.

The square root of 1356484781 is about 36830.4871132599. The cubic root of 1356484781 is about 1106.9762634291.

The spelling of 1356484781 in words is "one billion, three hundred fifty-six million, four hundred eighty-four thousand, seven hundred eighty-one".