1104021561 has 16 divisors (see below), whose sum is σ = 1523842560. Its totient is φ = 710142720.

The previous prime is 1104021547. The next prime is 1104021563. The reversal of 1104021561 is 1651204011.

It is not a de Polignac number, because 1104021561 - 2²³ = 1095632953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1104021563) 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, 155121 + ... + 162081.

It is an arithmetic number, because the mean of its divisors is an integer number (95240160).

Almost surely, 2^1104021561 is an apocalyptic number.

It is an amenable number.

1104021561 is a deficient number, since it is larger than the sum of its proper divisors (419820999).

1104021561 is a wasteful number, since it uses less digits than its factorization.

1104021561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1104021561 is about 33226.8199050105. The cubic root of 1104021561 is about 1033.5365786708.

Adding to 1104021561 its reverse (1651204011), we get a palindrome (2755225572).

The spelling of 1104021561 in words is "one billion, one hundred four million, twenty-one thousand, five hundred sixty-one".