31242213229 has 2 divisors, whose sum is σ = 31242213230. Its totient is φ = 31242213228.

The previous prime is 31242213203. The next prime is 31242213239. The reversal of 31242213229 is 92231224213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29682121225 + 1560092004 = 172285^2 + 39498^2 .

It is a cyclic number.

It is not a de Polignac number, because 31242213229 - 2³¹ = 29094729581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31242213229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31242213239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621106614 + 15621106615.

It is an arithmetic number, because the mean of its divisors is an integer number (15621106615).

Almost surely, 2^31242213229 is an apocalyptic number.

It is an amenable number.

31242213229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242213229 is an equidigital number, since it uses as much as digits as its factorization.

31242213229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The spelling of 31242213229 in words is "thirty-one billion, two hundred forty-two million, two hundred thirteen thousand, two hundred twenty-nine".