61155461 has 4 divisors (see below), whose sum is σ = 63264300. Its totient is φ = 59046624.

The previous prime is 61155383. The next prime is 61155491. The reversal of 61155461 is 16455116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10660225 + 50495236 = 3265^2 + 7106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61155461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2108809 = 61155461 / (6 + 1 + 1 + 5 + 5 + 4 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61155491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054376 + ... + 1054433.

It is an arithmetic number, because the mean of its divisors is an integer number (15816075).

Almost surely, 2^61155461 is an apocalyptic number.

It is an amenable number.

61155461 is a deficient number, since it is larger than the sum of its proper divisors (2108839).

61155461 is a wasteful number, since it uses less digits than its factorization.

61155461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108838.

The product of its digits is 3600, while the sum is 29.

The square root of 61155461 is about 7820.1957136634. The cubic root of 61155461 is about 393.9838454386.

It can be divided in two parts, 61155 and 461, that added together give a palindrome (61616).

The spelling of 61155461 in words is "sixty-one million, one hundred fifty-five thousand, four hundred sixty-one".