15121357397 has 2 divisors, whose sum is σ = 15121357398. Its totient is φ = 15121357396.

The previous prime is 15121357357. The next prime is 15121357399. The reversal of 15121357397 is 79375312151.

15121357397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9857709796 + 5263647601 = 99286^2 + 72551^2 .

It is an emirp because it is prime and its reverse (79375312151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15121357397 - 2¹² = 15121353301 is a prime.

Together with 15121357399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15121357399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560678698 + 7560678699.

It is an arithmetic number, because the mean of its divisors is an integer number (7560678699).

Almost surely, 2^15121357397 is an apocalyptic number.

It is an amenable number.

15121357397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15121357397 is an equidigital number, since it uses as much as digits as its factorization.

15121357397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198450, while the sum is 44.

The spelling of 15121357397 in words is "fifteen billion, one hundred twenty-one million, three hundred fifty-seven thousand, three hundred ninety-seven".