15212429509 has 2 divisors, whose sum is σ = 15212429510. Its totient is φ = 15212429508.

The previous prime is 15212429483. The next prime is 15212429527. The reversal of 15212429509 is 90592421251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14595056100 + 617373409 = 120810^2 + 24847^2 .

It is a cyclic number.

It is not a de Polignac number, because 15212429509 - 2¹³ = 15212421317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15212429809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7606214754 + 7606214755.

It is an arithmetic number, because the mean of its divisors is an integer number (7606214755).

Almost surely, 2^15212429509 is an apocalyptic number.

It is an amenable number.

15212429509 is a deficient number, since it is larger than the sum of its proper divisors (1).

15212429509 is an equidigital number, since it uses as much as digits as its factorization.

15212429509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 15212429509 in words is "fifteen billion, two hundred twelve million, four hundred twenty-nine thousand, five hundred nine".