61111945 has 4 divisors (see below), whose sum is σ = 73334340. Its totient is φ = 48889552.

The previous prime is 61111933. The next prime is 61111979. The reversal of 61111945 is 54911116.

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 9903609 + 51208336 = 3147^2 + 7156^2 .

It is a cyclic number.

It is not a de Polignac number, because 61111945 - 2⁵ = 61111913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6111190 + ... + 6111199.

It is an arithmetic number, because the mean of its divisors is an integer number (18333585).

Almost surely, 2^61111945 is an apocalyptic number.

It is an amenable number.

61111945 is a deficient number, since it is larger than the sum of its proper divisors (12222395).

61111945 is a wasteful number, since it uses less digits than its factorization.

61111945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222394.

The product of its digits is 1080, while the sum is 28.

The square root of 61111945 is about 7817.4129352363. The cubic root of 61111945 is about 393.8903750773.

The spelling of 61111945 in words is "sixty-one million, one hundred eleven thousand, nine hundred forty-five".