31230029 has 2 divisors, whose sum is σ = 31230030. Its totient is φ = 31230028.

The previous prime is 31229999. The next prime is 31230049. The reversal of 31230029 is 92003213.

It is an a-pointer prime, because the next prime (31230049) can be obtained adding 31230029 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 12264004 = 4355^2 + 3502^2 .

It is an emirp because it is prime and its reverse (92003213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31230029 - 2¹⁶ = 31164493 is a prime.

It is a super-2 number, since 2×31230029² = 1950629422681682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31230049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615014 + 15615015.

It is an arithmetic number, because the mean of its divisors is an integer number (15615015).

Almost surely, 2^31230029 is an apocalyptic number.

It is an amenable number.

31230029 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230029 is an equidigital number, since it uses as much as digits as its factorization.

31230029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31230029 is about 5588.3833977278. The cubic root of 31230029 is about 314.9131498196.

The spelling of 31230029 in words is "thirty-one million, two hundred thirty thousand, twenty-nine".