61000031 has 4 divisors (see below), whose sum is σ = 62297952. Its totient is φ = 59702112.

The previous prime is 61000003. The next prime is 61000039. The reversal of 61000031 is 13000016.

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 61000031 - 2¹⁰ = 60999007 is a prime.

It is a super-2 number, since 2×61000031² = 7442007564001922, 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 = 60999976 and 61000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000039) 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, 648890 + ... + 648983.

It is an arithmetic number, because the mean of its divisors is an integer number (15574488).

Almost surely, 2^61000031 is an apocalyptic number.

61000031 is a deficient number, since it is larger than the sum of its proper divisors (1297921).

61000031 is a wasteful number, since it uses less digits than its factorization.

61000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297920.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 61000031 is about 7810.2516604780. The cubic root of 61000031 is about 393.6497849940.

Adding to 61000031 its reverse (13000016), we get a palindrome (74000047).

The spelling of 61000031 in words is "sixty-one million, thirty-one", and thus it is an aban number and an uban number.