31149133 has 2 divisors, whose sum is σ = 31149134. Its totient is φ = 31149132.

The previous prime is 31149119. The next prime is 31149143. The reversal of 31149133 is 33194113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 9498724 = 4653^2 + 3082^2 .

It is an emirp because it is prime and its reverse (33194113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31149133 - 2¹⁷ = 31018061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31149098 and 31149107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31149143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15574566 + 15574567.

It is an arithmetic number, because the mean of its divisors is an integer number (15574567).

Almost surely, 2^31149133 is an apocalyptic number.

It is an amenable number.

31149133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31149133 is an equidigital number, since it uses as much as digits as its factorization.

31149133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 31149133 is about 5581.1408331989. The cubic root of 31149133 is about 314.6410053156.

The spelling of 31149133 in words is "thirty-one million, one hundred forty-nine thousand, one hundred thirty-three".