31145130 has 48 divisors (see below), whose sum is σ = 83776680. Its totient is φ = 8018304.

The previous prime is 31145129. The next prime is 31145131. The reversal of 31145130 is 3154113.

It is an interprime number because it is at equal distance from previous prime (31145129) and next prime (31145131).

It can be written as a sum of positive squares in 4 ways, for example, as 29062881 + 2082249 = 5391^2 + 1443^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31145131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3357 + ... + 8576.

Almost surely, 2^31145130 is an apocalyptic number.

31145130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31145130 is an abundant number, since it is smaller than the sum of its proper divisors (52631550).

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

31145130 is a wasteful number, since it uses less digits than its factorization.

31145130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11975 (or 11972 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 31145130 is about 5580.7822032400. The cubic root of 31145130 is about 314.6275264824.

Adding to 31145130 its reverse (3154113), we get a palindrome (34299243).

It can be divided in two parts, 31 and 145130, that added together give a square (145161 = 381²).

The spelling of 31145130 in words is "thirty-one million, one hundred forty-five thousand, one hundred thirty".