61332431 has 4 divisors (see below), whose sum is σ = 61375272. Its totient is φ = 61289592.

The previous prime is 61332407. The next prime is 61332451. The reversal of 61332431 is 13423316.

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 61332431 - 2¹⁰ = 61331407 is a prime.

It is a super-2 number, since 2×61332431² = 7523334184739522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61332397 and 61332406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61332451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19196 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (15343818).

Almost surely, 2^61332431 is an apocalyptic number.

61332431 is a deficient number, since it is larger than the sum of its proper divisors (42841).

61332431 is a wasteful number, since it uses less digits than its factorization.

61332431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42840.

The product of its digits is 1296, while the sum is 23.

The square root of 61332431 is about 7831.5024739829. The cubic root of 61332431 is about 394.3635126748.

Adding to 61332431 its reverse (13423316), we get a palindrome (74755747).

The spelling of 61332431 in words is "sixty-one million, three hundred thirty-two thousand, four hundred thirty-one".