61851047 has 4 divisors (see below), whose sum is σ = 61874160. Its totient is φ = 61827936.

The previous prime is 61851037. The next prime is 61851067. The reversal of 61851047 is 74015816.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61851047 - 2¹² = 61846951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61851007) 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, 6923 + ... + 13100.

It is an arithmetic number, because the mean of its divisors is an integer number (15468540).

Almost surely, 2^61851047 is an apocalyptic number.

61851047 is a deficient number, since it is larger than the sum of its proper divisors (23113).

61851047 is a wasteful number, since it uses less digits than its factorization.

61851047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23112.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 61851047 is about 7864.5436612686. The cubic root of 61851047 is about 395.4719499052.

The spelling of 61851047 in words is "sixty-one million, eight hundred fifty-one thousand, forty-seven".