61869231 has 16 divisors (see below), whose sum is σ = 91814400. Its totient is φ = 41175864.

The previous prime is 61869221. The next prime is 61869259. The reversal of 61869231 is 13296816.

61869231 is a `hidden beast` number, since 618 + 6 + 9 + 2 + 31 = 666.

61869231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61869231 - 2¹⁰ = 61868207 is a prime.

It is a super-2 number, since 2×61869231² = 7655603489062722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61869221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17820 + ... + 21006.

It is an arithmetic number, because the mean of its divisors is an integer number (5738400).

Almost surely, 2^61869231 is an apocalyptic number.

61869231 is a deficient number, since it is larger than the sum of its proper divisors (29945169).

61869231 is a wasteful number, since it uses less digits than its factorization.

61869231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3909 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 61869231 is about 7865.6996510164. The cubic root of 61869231 is about 395.5107019160.

The spelling of 61869231 in words is "sixty-one million, eight hundred sixty-nine thousand, two hundred thirty-one".