1101621563 has 4 divisors (see below), whose sum is σ = 1258996080. Its totient is φ = 944247048.

The previous prime is 1101621527. The next prime is 1101621617. The reversal of 1101621563 is 3651261011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3651261011 = 67 ⋅54496433.

It is a cyclic number.

It is not a de Polignac number, because 1101621563 - 2¹⁰ = 1101620539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1101621503) 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, 78687248 + ... + 78687261.

It is an arithmetic number, because the mean of its divisors is an integer number (314749020).

Almost surely, 2^1101621563 is an apocalyptic number.

1101621563 is a deficient number, since it is larger than the sum of its proper divisors (157374517).

1101621563 is an equidigital number, since it uses as much as digits as its factorization.

1101621563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157374516.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1101621563 is about 33190.6848829608. The cubic root of 1101621563 is about 1032.7871110275.

Adding to 1101621563 its reverse (3651261011), we get a palindrome (4752882574).

The spelling of 1101621563 in words is "one billion, one hundred one million, six hundred twenty-one thousand, five hundred sixty-three".