1654004561 has 4 divisors (see below), whose sum is σ = 1804368624. Its totient is φ = 1503640500.

The previous prime is 1654004557. The next prime is 1654004621.

1654004561 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 1654004561 - 2² = 1654004557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1654000561) 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, 75182015 + ... + 75182036.

It is an arithmetic number, because the mean of its divisors is an integer number (451092156).

Almost surely, 2^1654004561 is an apocalyptic number.

1654004561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1654004561 is a deficient number, since it is larger than the sum of its proper divisors (150364063).

1654004561 is a wasteful number, since it uses less digits than its factorization.

1654004561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150364062.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1654004561 is about 40669.4548893884. The cubic root of 1654004561 is about 1182.6209483446.

It can be divided in two parts, 165400 and 4561, that added together give a palindrome (169961).

The spelling of 1654004561 in words is "one billion, six hundred fifty-four million, four thousand, five hundred sixty-one".