31100149 has 2 divisors, whose sum is σ = 31100150. Its totient is φ = 31100148.

The previous prime is 31100101. The next prime is 31100171. The reversal of 31100149 is 94100113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26193924 + 4906225 = 5118^2 + 2215^2 .

It is an emirp because it is prime and its reverse (94100113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31100149 - 2¹¹ = 31098101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31100189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550074 + 15550075.

It is an arithmetic number, because the mean of its divisors is an integer number (15550075).

Almost surely, 2^31100149 is an apocalyptic number.

It is an amenable number.

31100149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31100149 is an equidigital number, since it uses as much as digits as its factorization.

31100149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 31100149 is about 5576.7507564889. The cubic root of 31100149 is about 314.4759877633.

The spelling of 31100149 in words is "thirty-one million, one hundred thousand, one hundred forty-nine".