61985131 has 4 divisors (see below), whose sum is σ = 66753232. Its totient is φ = 57217032.

The previous prime is 61985129. The next prime is 61985137. The reversal of 61985131 is 13158916.

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 61985131 - 2¹ = 61985129 is a prime.

It is a super-2 number, since 2×61985131² = 7684312930174322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61985137) 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, 2384031 + ... + 2384056.

It is an arithmetic number, because the mean of its divisors is an integer number (16688308).

Almost surely, 2^61985131 is an apocalyptic number.

61985131 is a deficient number, since it is larger than the sum of its proper divisors (4768101).

61985131 is a wasteful number, since it uses less digits than its factorization.

61985131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768100.

The product of its digits is 6480, while the sum is 34.

The square root of 61985131 is about 7873.0636349518. The cubic root of 61985131 is about 395.7575187124.

The spelling of 61985131 in words is "sixty-one million, nine hundred eighty-five thousand, one hundred thirty-one".