61169945 has 4 divisors (see below), whose sum is σ = 73403940. Its totient is φ = 48935952.

The previous prime is 61169939. The next prime is 61169947. The reversal of 61169945 is 54996116.

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 24167056 + 37002889 = 4916^2 + 6083^2 .

It is a cyclic number.

It is not a de Polignac number, because 61169945 - 2¹² = 61165849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61169947) 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, 6116990 + ... + 6116999.

It is an arithmetic number, because the mean of its divisors is an integer number (18350985).

Almost surely, 2^61169945 is an apocalyptic number.

It is an amenable number.

61169945 is a deficient number, since it is larger than the sum of its proper divisors (12233995).

61169945 is a wasteful number, since it uses less digits than its factorization.

61169945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12233994.

The product of its digits is 58320, while the sum is 41.

The square root of 61169945 is about 7821.1217226175. The cubic root of 61169945 is about 394.0149465672.

It can be divided in two parts, 6116 and 9945, that added together give a palindrome (16061).

The spelling of 61169945 in words is "sixty-one million, one hundred sixty-nine thousand, nine hundred forty-five".