31130549 has 2 divisors, whose sum is σ = 31130550. Its totient is φ = 31130548.

The previous prime is 31130527. The next prime is 31130551. The reversal of 31130549 is 94503113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 9878449 = 4610^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130549 - 2²⁰ = 30081973 is a prime.

It is a super-2 number, since 2×31130549² = 1938222162082802, which contains 22 as substring.

Together with 31130551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31130599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565274 + 15565275.

It is an arithmetic number, because the mean of its divisors is an integer number (15565275).

Almost surely, 2^31130549 is an apocalyptic number.

It is an amenable number.

31130549 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130549 is an equidigital number, since it uses as much as digits as its factorization.

31130549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 31130549 is about 5579.4756922134. The cubic root of 31130549 is about 314.5784198210.

The spelling of 31130549 in words is "thirty-one million, one hundred thirty thousand, five hundred forty-nine".