1355153561 has 4 divisors (see below), whose sum is σ = 1398868224. Its totient is φ = 1311438900.

The previous prime is 1355153551. The next prime is 1355153563. The reversal of 1355153561 is 1653515531.

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 an emirpimes, since its reverse is a distinct semiprime: 1653515531 = 30059 ⋅55009.

It is a cyclic number.

It is not a de Polignac number, because 1355153561 - 2⁶ = 1355153497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355153563) 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, 21857285 + ... + 21857346.

It is an arithmetic number, because the mean of its divisors is an integer number (349717056).

Almost surely, 2^1355153561 is an apocalyptic number.

It is an amenable number.

1355153561 is a deficient number, since it is larger than the sum of its proper divisors (43714663).

1355153561 is an equidigital number, since it uses as much as digits as its factorization.

1355153561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43714662.

The product of its digits is 33750, while the sum is 35.

The square root of 1355153561 is about 36812.4104209436. The cubic root of 1355153561 is about 1106.6140253645.

The spelling of 1355153561 in words is "one billion, three hundred fifty-five million, one hundred fifty-three thousand, five hundred sixty-one".