61749147 has 4 divisors (see below), whose sum is σ = 82332200. Its totient is φ = 41166096.

The previous prime is 61749137. The next prime is 61749173. The reversal of 61749147 is 74194716.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61749147 - 2⁴ = 61749131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61749137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10291522 + ... + 10291527.

It is an arithmetic number, because the mean of its divisors is an integer number (20583050).

Almost surely, 2^61749147 is an apocalyptic number.

61749147 is a deficient number, since it is larger than the sum of its proper divisors (20583053).

61749147 is a wasteful number, since it uses less digits than its factorization.

61749147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20583052.

The product of its digits is 42336, while the sum is 39.

The square root of 61749147 is about 7858.0625474731. The cubic root of 61749147 is about 395.2546496618.

The spelling of 61749147 in words is "sixty-one million, seven hundred forty-nine thousand, one hundred forty-seven".