42249961 has 4 divisors (see below), whose sum is σ = 45499972. Its totient is φ = 38999952.

The previous prime is 42249953. The next prime is 42249973. The reversal of 42249961 is 16994224.

It is a happy number.

42249961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10112400 + 32137561 = 3180^2 + 5669^2 .

It is a cyclic number.

It is not a de Polignac number, because 42249961 - 2³ = 42249953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42249961.

It is not an unprimeable number, because it can be changed into a prime (42249941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624986 + ... + 1625011.

It is an arithmetic number, because the mean of its divisors is an integer number (11374993).

Almost surely, 2^42249961 is an apocalyptic number.

It is an amenable number.

42249961 is a deficient number, since it is larger than the sum of its proper divisors (3250011).

42249961 is a wasteful number, since it uses less digits than its factorization.

42249961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250010.

The product of its digits is 31104, while the sum is 37.

The square root of 42249961 is about 6499.9969999993. The cubic root of 42249961 is about 348.2908812276.

The spelling of 42249961 in words is "forty-two million, two hundred forty-nine thousand, nine hundred sixty-one".