31061000 has 64 divisors (see below), whose sum is σ = 73710000. Its totient is φ = 12249600.

The previous prime is 31060979. The next prime is 31061003. The reversal of 31061000 is 16013.

It can be written as a sum of positive squares in 8 ways, for example, as 568516 + 30492484 = 754^2 + 5522^2 .

It is not an unprimeable number, because it can be changed into a prime (31061003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88826 + ... + 89174.

Almost surely, 2^31061000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31061000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36855000).

31061000 is an abundant number, since it is smaller than the sum of its proper divisors (42649000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31061000 is a wasteful number, since it uses less digits than its factorization.

31061000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 445 counting only the distinct ones).

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

The square root of 31061000 is about 5573.2396323862. The cubic root of 31061000 is about 314.3439777854.

Adding to 31061000 its reverse (16013), we get a palindrome (31077013).

The spelling of 31061000 in words is "thirty-one million, sixty-one thousand".