1365781231 has 2 divisors, whose sum is σ = 1365781232. Its totient is φ = 1365781230.

The previous prime is 1365781223. The next prime is 1365781279. The reversal of 1365781231 is 1321875631.

It is a weak prime.

It is an emirp because it is prime and its reverse (1321875631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1365781231 - 2³ = 1365781223 is a prime.

It is a super-2 number, since 2×1365781231² = 3730716741903750722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1365781931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682890615 + 682890616.

It is an arithmetic number, because the mean of its divisors is an integer number (682890616).

Almost surely, 2^1365781231 is an apocalyptic number.

1365781231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365781231 is an equidigital number, since it uses as much as digits as its factorization.

1365781231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 1365781231 is about 36956.4775242447. The cubic root of 1365781231 is about 1109.4993362047.

The spelling of 1365781231 in words is "one billion, three hundred sixty-five million, seven hundred eighty-one thousand, two hundred thirty-one".