31561130 has 8 divisors (see below), whose sum is σ = 56810052. Its totient is φ = 12624448.

The previous prime is 31561121. The next prime is 31561139. The reversal of 31561130 is 3116513.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31561121) and next prime (31561139).

It can be written as a sum of positive squares in 2 ways, for example, as 29626249 + 1934881 = 5443^2 + 1391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×31561130² = 1992209853753800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31561139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578047 + ... + 1578066.

Almost surely, 2^31561130 is an apocalyptic number.

31561130 is a deficient number, since it is larger than the sum of its proper divisors (25248922).

31561130 is a wasteful number, since it uses less digits than its factorization.

31561130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156120.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 31561130 is about 5617.9293338382. The cubic root of 31561130 is about 316.0221436707.

Adding to 31561130 its reverse (3116513), we get a palindrome (34677643).

The spelling of 31561130 in words is "thirty-one million, five hundred sixty-one thousand, one hundred thirty".