1358641261 has 4 divisors (see below), whose sum is σ = 1359560124. Its totient is φ = 1357722400.

The previous prime is 1358641253. The next prime is 1358641283. The reversal of 1358641261 is 1621468531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1621468531 = 19 ⋅85340449.

It can be written as a sum of positive squares in 2 ways, for example, as 310112100 + 1048529161 = 17610^2 + 32381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1358641261 - 2³ = 1358641253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1358641261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358641861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457210 + ... + 460171.

It is an arithmetic number, because the mean of its divisors is an integer number (339890031).

Almost surely, 2^1358641261 is an apocalyptic number.

It is an amenable number.

1358641261 is a deficient number, since it is larger than the sum of its proper divisors (918863).

1358641261 is an equidigital number, since it uses as much as digits as its factorization.

1358641261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918862.

The product of its digits is 34560, while the sum is 37.

The square root of 1358641261 is about 36859.7512335610. The cubic root of 1358641261 is about 1107.5625602838.

The spelling of 1358641261 in words is "one billion, three hundred fifty-eight million, six hundred forty-one thousand, two hundred sixty-one".