61243145 has 8 divisors (see below), whose sum is σ = 73728456. Its totient is φ = 48836736.

The previous prime is 61243139. The next prime is 61243183. The reversal of 61243145 is 54134216.

It can be written as a sum of positive squares in 4 ways, for example, as 4376464 + 56866681 = 2092^2 + 7541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61243145 - 2⁶ = 61243081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18002 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (9216057).

Almost surely, 2^61243145 is an apocalyptic number.

It is an amenable number.

61243145 is a deficient number, since it is larger than the sum of its proper divisors (12485311).

61243145 is a wasteful number, since it uses less digits than its factorization.

61243145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39451.

The product of its digits is 2880, while the sum is 26.

The square root of 61243145 is about 7825.7999591096. The cubic root of 61243145 is about 394.1720520272.

The spelling of 61243145 in words is "sixty-one million, two hundred forty-three thousand, one hundred forty-five".