61782231 has 8 divisors (see below), whose sum is σ = 94144384. Its totient is φ = 35304120.

The previous prime is 61782221. The next prime is 61782251. The reversal of 61782231 is 13228716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61782231 - 2¹⁰ = 61781207 is a prime.

It is a super-2 number, since 2×61782231² = 7634088134674722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61782221) 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 7 ways as a sum of consecutive naturals, for example, 1470985 + ... + 1471026.

It is an arithmetic number, because the mean of its divisors is an integer number (11768048).

Almost surely, 2^61782231 is an apocalyptic number.

61782231 is a deficient number, since it is larger than the sum of its proper divisors (32362153).

61782231 is a wasteful number, since it uses less digits than its factorization.

61782231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942021.

The product of its digits is 4032, while the sum is 30.

The square root of 61782231 is about 7860.1673646303. The cubic root of 61782231 is about 395.3252269937.

The spelling of 61782231 in words is "sixty-one million, seven hundred eighty-two thousand, two hundred thirty-one".