61641031 has 4 divisors (see below), whose sum is σ = 65266992. Its totient is φ = 58015072.

The previous prime is 61641011. The next prime is 61641053. The reversal of 61641031 is 13014616.

It is a happy number.

61641031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61641031 - 2⁷ = 61640903 is a prime.

It is a super-2 number, since 2×61641031² = 7599233405485922, 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 = 61640993 and 61641011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641011) 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 3 ways as a sum of consecutive naturals, for example, 1812955 + ... + 1812988.

It is an arithmetic number, because the mean of its divisors is an integer number (16316748).

Almost surely, 2^61641031 is an apocalyptic number.

61641031 is a deficient number, since it is larger than the sum of its proper divisors (3625961).

61641031 is a wasteful number, since it uses less digits than its factorization.

61641031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625960.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 61641031 is about 7851.1802297489. The cubic root of 61641031 is about 395.0238323494.

Adding to 61641031 its reverse (13014616), we get a palindrome (74655647).

The spelling of 61641031 in words is "sixty-one million, six hundred forty-one thousand, thirty-one".