61018931 has 4 divisors (see below), whose sum is σ = 63671952. Its totient is φ = 58365912.

The previous prime is 61018907. The next prime is 61018939. The reversal of 61018931 is 13981016.

It is a happy number.

61018931 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 61018931 - 2²² = 56824627 is a prime.

It is a super-2 number, since 2×61018931² = 7446619880765522, 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 = 61018894 and 61018903.

It is not an unprimeable number, because it can be changed into a prime (61018939) 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, 1326476 + ... + 1326521.

It is an arithmetic number, because the mean of its divisors is an integer number (15917988).

Almost surely, 2^61018931 is an apocalyptic number.

61018931 is a deficient number, since it is larger than the sum of its proper divisors (2653021).

61018931 is a wasteful number, since it uses less digits than its factorization.

61018931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653020.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 61018931 is about 7811.4615149791. The cubic root of 61018931 is about 393.6904364088.

Adding to 61018931 its reverse (13981016), we get a palindrome (74999947).

The spelling of 61018931 in words is "sixty-one million, eighteen thousand, nine hundred thirty-one".