61223945 has 4 divisors (see below), whose sum is σ = 73468740. Its totient is φ = 48979152.

The previous prime is 61223923. The next prime is 61223969. The reversal of 61223945 is 54932216.

It is a happy number.

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 25928464 + 35295481 = 5092^2 + 5941^2 .

It is a cyclic number.

It is not a de Polignac number, because 61223945 - 2⁸ = 61223689 is a prime.

It is an unprimeable number.

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, 6122390 + ... + 6122399.

It is an arithmetic number, because the mean of its divisors is an integer number (18367185).

Almost surely, 2^61223945 is an apocalyptic number.

It is an amenable number.

61223945 is a deficient number, since it is larger than the sum of its proper divisors (12244795).

61223945 is a wasteful number, since it uses less digits than its factorization.

61223945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12244794.

The product of its digits is 12960, while the sum is 32.

The square root of 61223945 is about 7824.5731512971. The cubic root of 61223945 is about 394.1308561545.

The spelling of 61223945 in words is "sixty-one million, two hundred twenty-three thousand, nine hundred forty-five".