1611214561 has 8 divisors (see below), whose sum is σ = 1834110144. Its totient is φ = 1401055920.

The previous prime is 1611214537. The next prime is 1611214589. The reversal of 1611214561 is 1654121161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1611214561 - 2⁵ = 1611214529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611214531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3183966 + ... + 3184471.

It is an arithmetic number, because the mean of its divisors is an integer number (229263768).

Almost surely, 2^1611214561 is an apocalyptic number.

1611214561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1611214561 is a deficient number, since it is larger than the sum of its proper divisors (222895583).

1611214561 is a wasteful number, since it uses less digits than its factorization.

1611214561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368471.

The product of its digits is 1440, while the sum is 28.

The square root of 1611214561 is about 40139.9372321383. The cubic root of 1611214561 is about 1172.3333668752. Note that the first 4 decimals are identical.

The spelling of 1611214561 in words is "one billion, six hundred eleven million, two hundred fourteen thousand, five hundred sixty-one".