31616130 has 128 divisors (see below), whose sum is σ = 96219648. Its totient is φ = 6469632.

The previous prime is 31616129. The next prime is 31616149. The reversal of 31616130 is 3161613.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31616097 and 31616106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100854 + ... + 101166.

It is an arithmetic number, because the mean of its divisors is an integer number (751716).

Almost surely, 2^31616130 is an apocalyptic number.

31616130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31616130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48109824).

31616130 is an abundant number, since it is smaller than the sum of its proper divisors (64603518).

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

31616130 is a wasteful number, since it uses less digits than its factorization.

31616130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31616130 is about 5622.8222451008. The cubic root of 31616130 is about 316.2056091255.

Adding to 31616130 its reverse (3161613), we get a palindrome (34777743).

The spelling of 31616130 in words is "thirty-one million, six hundred sixteen thousand, one hundred thirty".