15251020397 has 2 divisors, whose sum is σ = 15251020398. Its totient is φ = 15251020396.

The previous prime is 15251020391. The next prime is 15251020427. The reversal of 15251020397 is 79302015251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11527457956 + 3723562441 = 107366^2 + 61021^2 .

It is an emirp because it is prime and its reverse (79302015251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15251020397 - 2¹⁰ = 15251019373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15251020391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7625510198 + 7625510199.

It is an arithmetic number, because the mean of its divisors is an integer number (7625510199).

Almost surely, 2^15251020397 is an apocalyptic number.

It is an amenable number.

15251020397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15251020397 is an equidigital number, since it uses as much as digits as its factorization.

15251020397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 15251020397 in words is "fifteen billion, two hundred fifty-one million, twenty thousand, three hundred ninety-seven".