1358681261 has 6 divisors (see below), whose sum is σ = 1580506830. Its totient is φ = 1164583896.

The previous prime is 1358681257. The next prime is 1358681267. The reversal of 1358681261 is 1621868531.

It can be written as a sum of positive squares in only one way, i.e., 1016653225 + 342028036 = 31885^2 + 18494^2 .

It is not a de Polignac number, because 1358681261 - 2² = 1358681257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358681267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13864046 + ... + 13864143.

It is an arithmetic number, because the mean of its divisors is an integer number (263417805).

Almost surely, 2^1358681261 is an apocalyptic number.

It is an amenable number.

1358681261 is a deficient number, since it is larger than the sum of its proper divisors (221825569).

1358681261 is an equidigital number, since it uses as much as digits as its factorization.

1358681261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27728203 (or 27728196 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 1358681261 is about 36860.2938268267. The cubic root of 1358681261 is about 1107.5734294928.

The spelling of 1358681261 in words is "one billion, three hundred fifty-eight million, six hundred eighty-one thousand, two hundred sixty-one".