1355511561 has 16 divisors (see below), whose sum is σ = 1838715648. Its totient is φ = 888019200.

The previous prime is 1355511551. The next prime is 1355511583. The reversal of 1355511561 is 1651155531.

It is not a de Polignac number, because 1355511561 - 2⁶ = 1355511497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1355511551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234496 + ... + 240206.

It is an arithmetic number, because the mean of its divisors is an integer number (114919728).

Almost surely, 2^1355511561 is an apocalyptic number.

It is an amenable number.

1355511561 is a deficient number, since it is larger than the sum of its proper divisors (483204087).

1355511561 is a wasteful number, since it uses less digits than its factorization.

1355511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072.

The product of its digits is 11250, while the sum is 33.

The square root of 1355511561 is about 36817.2725904568. The cubic root of 1355511561 is about 1106.7114639997.

The spelling of 1355511561 in words is "one billion, three hundred fifty-five million, five hundred eleven thousand, five hundred sixty-one".