61432131 has 4 divisors (see below), whose sum is σ = 81909512. Its totient is φ = 40954752.

The previous prime is 61432123. The next prime is 61432153. The reversal of 61432131 is 13123416.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61432131 - 2³ = 61432123 is a prime.

It is a super-2 number, since 2×61432131² = 7547813438402322, 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 = 61432098 and 61432107.

It is not an unprimeable number, because it can be changed into a prime (61432031) 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, 10238686 + ... + 10238691.

It is an arithmetic number, because the mean of its divisors is an integer number (20477378).

Almost surely, 2^61432131 is an apocalyptic number.

61432131 is a deficient number, since it is larger than the sum of its proper divisors (20477381).

61432131 is a wasteful number, since it uses less digits than its factorization.

61432131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20477380.

The product of its digits is 432, while the sum is 21.

The square root of 61432131 is about 7837.8652068022. The cubic root of 61432131 is about 394.5770851469.

Adding to 61432131 its reverse (13123416), we get a palindrome (74555547).

The spelling of 61432131 in words is "sixty-one million, four hundred thirty-two thousand, one hundred thirty-one".