61302431 has 4 divisors (see below), whose sum is σ = 61750032. Its totient is φ = 60854832.

The previous prime is 61302427. The next prime is 61302443. The reversal of 61302431 is 13420316.

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 61302431 - 2² = 61302427 is a prime.

It is a super-2 number, since 2×61302431² = 7515976093019522, 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 (61302331) 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 3 ways as a sum of consecutive naturals, for example, 223595 + ... + 223868.

It is an arithmetic number, because the mean of its divisors is an integer number (15437508).

Almost surely, 2^61302431 is an apocalyptic number.

61302431 is a deficient number, since it is larger than the sum of its proper divisors (447601).

61302431 is a wasteful number, since it uses less digits than its factorization.

61302431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447600.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 61302431 is about 7829.5868984257. The cubic root of 61302431 is about 394.2992028434.

Adding to 61302431 its reverse (13420316), we get a palindrome (74722747).

The spelling of 61302431 in words is "sixty-one million, three hundred two thousand, four hundred thirty-one".