1358011261 has 4 divisors (see below), whose sum is σ = 1363059900. Its totient is φ = 1352962624.

The previous prime is 1358011253. The next prime is 1358011297. The reversal of 1358011261 is 1621108531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1621108531 = 7 ⋅231586933.

It can be written as a sum of positive squares in 2 ways, for example, as 365383225 + 992628036 = 19115^2 + 31506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1358011261 - 2³ = 1358011253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358011211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2523916 + ... + 2524453.

It is an arithmetic number, because the mean of its divisors is an integer number (340764975).

Almost surely, 2^1358011261 is an apocalyptic number.

It is an amenable number.

1358011261 is a deficient number, since it is larger than the sum of its proper divisors (5048639).

1358011261 is an equidigital number, since it uses as much as digits as its factorization.

1358011261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048638.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1358011261 is about 36851.2043358151. The cubic root of 1358011261 is about 1107.3913420941.

Adding to 1358011261 its reverse (1621108531), we get a palindrome (2979119792).

The spelling of 1358011261 in words is "one billion, three hundred fifty-eight million, eleven thousand, two hundred sixty-one".