61545161 has 4 divisors (see below), whose sum is σ = 64784400. Its totient is φ = 58305924.

The previous prime is 61545139. The next prime is 61545167. The reversal of 61545161 is 16154516.

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 61545161 - 2¹⁴ = 61528777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61545167) 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, 1619591 + ... + 1619628.

It is an arithmetic number, because the mean of its divisors is an integer number (16196100).

Almost surely, 2^61545161 is an apocalyptic number.

It is an amenable number.

61545161 is a deficient number, since it is larger than the sum of its proper divisors (3239239).

61545161 is a wasteful number, since it uses less digits than its factorization.

61545161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239238.

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

The square root of 61545161 is about 7845.0724024702. The cubic root of 61545161 is about 394.8189331955.

Adding to 61545161 its reverse (16154516), we get a palindrome (77699677).

The spelling of 61545161 in words is "sixty-one million, five hundred forty-five thousand, one hundred sixty-one".