15401257 has 2 divisors, whose sum is σ = 15401258. Its totient is φ = 15401256.

The previous prime is 15401251. The next prime is 15401261. The reversal of 15401257 is 75210451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15397776 + 3481 = 3924^2 + 59^2 .

It is an emirp because it is prime and its reverse (75210451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15401257 - 2¹⁵ = 15368489 is a prime.

It is not a weakly prime, because it can be changed into another prime (15401251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7700628 + 7700629.

It is an arithmetic number, because the mean of its divisors is an integer number (7700629).

Almost surely, 2^15401257 is an apocalyptic number.

It is an amenable number.

15401257 is a deficient number, since it is larger than the sum of its proper divisors (1).

15401257 is an equidigital number, since it uses as much as digits as its factorization.

15401257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 15401257 is about 3924.4435274316. The cubic root of 15401257 is about 248.8009624295.

The spelling of 15401257 in words is "fifteen million, four hundred one thousand, two hundred fifty-seven".