31215215142469 has 2 divisors, whose sum is σ = 31215215142470. Its totient is φ = 31215215142468.

The previous prime is 31215215142409. The next prime is 31215215142509. The reversal of 31215215142469 is 96424151251213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25491340721025 + 5723874421444 = 5048895^2 + 2392462^2 .

It is an emirp because it is prime and its reverse (96424151251213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31215215142469 - 2¹⁷ = 31215215011397 is a prime.

It is a super-2 number, since 2×31215215142469² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31215215142409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15607607571234 + 15607607571235.

It is an arithmetic number, because the mean of its divisors is an integer number (15607607571235).

Almost surely, 2^{31215215142469} is an apocalyptic number.

It is an amenable number.

31215215142469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31215215142469 is an equidigital number, since it uses as much as digits as its factorization.

31215215142469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The spelling of 31215215142469 in words is "thirty-one trillion, two hundred fifteen billion, two hundred fifteen million, one hundred forty-two thousand, four hundred sixty-nine".