1353611261 has 4 divisors (see below), whose sum is σ = 1353714432. Its totient is φ = 1353508092.

The previous prime is 1353611183. The next prime is 1353611317. The reversal of 1353611261 is 1621163531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1621163531 = 13 ⋅124704887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1353611261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353616261) 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, 28445 + ... + 59298.

It is an arithmetic number, because the mean of its divisors is an integer number (338428608).

Almost surely, 2^1353611261 is an apocalyptic number.

It is an amenable number.

1353611261 is a deficient number, since it is larger than the sum of its proper divisors (103171).

1353611261 is an equidigital number, since it uses as much as digits as its factorization.

1353611261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103170.

The product of its digits is 3240, while the sum is 29.

The square root of 1353611261 is about 36791.4563587798. The cubic root of 1353611261 is about 1106.1940535998.

Adding to 1353611261 its reverse (1621163531), we get a palindrome (2974774792).

The spelling of 1353611261 in words is "one billion, three hundred fifty-three million, six hundred eleven thousand, two hundred sixty-one".