61985851 has 4 divisors (see below), whose sum is σ = 64680912. Its totient is φ = 59290792.

The previous prime is 61985837. The next prime is 61985857. The reversal of 61985851 is 15858916.

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 61985851 - 2¹³ = 61977659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61985798 and 61985807.

It is not an unprimeable number, because it can be changed into a prime (61985857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347496 + ... + 1347541.

It is an arithmetic number, because the mean of its divisors is an integer number (16170228).

Almost surely, 2^61985851 is an apocalyptic number.

61985851 is a deficient number, since it is larger than the sum of its proper divisors (2695061).

61985851 is a wasteful number, since it uses less digits than its factorization.

61985851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695060.

The product of its digits is 86400, while the sum is 43.

The square root of 61985851 is about 7873.1093603480. The cubic root of 61985851 is about 395.7590510385.

The spelling of 61985851 in words is "sixty-one million, nine hundred eighty-five thousand, eight hundred fifty-one".