31061394 has 160 divisors (see below), whose sum is σ = 89443200. Its totient is φ = 8001504.

The previous prime is 31061369. The next prime is 31061399. The reversal of 31061394 is 49316013.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31061399) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 722337 + ... + 722379.

It is an arithmetic number, because the mean of its divisors is an integer number (559020).

Almost surely, 2^31061394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31061394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44721600).

31061394 is an abundant number, since it is smaller than the sum of its proper divisors (58381806).

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

31061394 is a wasteful number, since it uses less digits than its factorization.

31061394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 31061394 is about 5573.2749797583. The cubic root of 31061394 is about 314.3453069013.

The spelling of 31061394 in words is "thirty-one million, sixty-one thousand, three hundred ninety-four".