61055861 has 4 divisors (see below), whose sum is σ = 61828800. Its totient is φ = 60282924.

The previous prime is 61055843. The next prime is 61055881. The reversal of 61055861 is 16855016.

It is a happy number.

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 61055861 - 2¹⁴ = 61039477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61055801) 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, 386351 + ... + 386508.

It is an arithmetic number, because the mean of its divisors is an integer number (15457200).

Almost surely, 2^61055861 is an apocalyptic number.

It is an amenable number.

61055861 is a deficient number, since it is larger than the sum of its proper divisors (772939).

61055861 is an equidigital number, since it uses as much as digits as its factorization.

61055861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772938.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 61055861 is about 7813.8249916414. The cubic root of 61055861 is about 393.7698437635.

It can be divided in two parts, 61055 and 861, that added together give a palindrome (61916).

The spelling of 61055861 in words is "sixty-one million, fifty-five thousand, eight hundred sixty-one".