31020861040 has 160 divisors (see below), whose sum is σ = 79523410176. Its totient is φ = 11182018560.

The previous prime is 31020861029. The next prime is 31020861041. The reversal of 31020861040 is 4016802013.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 31020860996 and 31020861014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020861041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37783830 + ... + 37784650.

Almost surely, 2^31020861040 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 31020861040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39761705088).

31020861040 is an abundant number, since it is smaller than the sum of its proper divisors (48502549136).

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

31020861040 is a wasteful number, since it uses less digits than its factorization.

31020861040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 31020861040 in words is "thirty-one billion, twenty million, eight hundred sixty-one thousand, forty".