31000061 has 4 divisors (see below), whose sum is σ = 32823612. Its totient is φ = 29176512.

The previous prime is 31000003. The next prime is 31000063. The reversal of 31000061 is 16000013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16000013 = 431 ⋅37123.

It can be written as a sum of positive squares in 2 ways, for example, as 16605625 + 14394436 = 4075^2 + 3794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31000061 is a prime.

It is a super-2 number, since 2×31000061² = 1922007564007442, 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 (31000063) 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, 911750 + ... + 911783.

It is an arithmetic number, because the mean of its divisors is an integer number (8205903).

Almost surely, 2^31000061 is an apocalyptic number.

It is an amenable number.

31000061 is a deficient number, since it is larger than the sum of its proper divisors (1823551).

31000061 is a wasteful number, since it uses less digits than its factorization.

31000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823550.

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

The square root of 31000061 is about 5567.7698407890. The cubic root of 31000061 is about 314.1382712866.

Adding to 31000061 its reverse (16000013), we get a palindrome (47000074).

The spelling of 31000061 in words is "thirty-one million, sixty-one", and thus it is an aban number and an uban number.