612261561 has 8 divisors (see below), whose sum is σ = 824274880. Its totient is φ = 404211312.

The previous prime is 612261557. The next prime is 612261581. The reversal of 612261561 is 165162216.

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

It is not a de Polignac number, because 612261561 - 2² = 612261557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (612261581) 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, 990406 + ... + 991023.

It is an arithmetic number, because the mean of its divisors is an integer number (103034360).

Almost surely, 2^612261561 is an apocalyptic number.

It is an amenable number.

612261561 is a deficient number, since it is larger than the sum of its proper divisors (212013319).

612261561 is a wasteful number, since it uses less digits than its factorization.

612261561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981535.

The product of its digits is 4320, while the sum is 30.

The square root of 612261561 is about 24743.9196773672. The cubic root of 612261561 is about 849.1394108755.

It can be divided in two parts, 61 and 2261561, that added together give a palindrome (2261622).

The spelling of 612261561 in words is "six hundred twelve million, two hundred sixty-one thousand, five hundred sixty-one".