1389257501 has 2 divisors, whose sum is σ = 1389257502. Its totient is φ = 1389257500.

The previous prime is 1389257491. The next prime is 1389257503. The reversal of 1389257501 is 1057529831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749116900 + 640140601 = 27370^2 + 25301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389257501 is a prime.

Together with 1389257503, 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 (1389257503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694628750 + 694628751.

It is an arithmetic number, because the mean of its divisors is an integer number (694628751).

Almost surely, 2^1389257501 is an apocalyptic number.

It is an amenable number.

1389257501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389257501 is an equidigital number, since it uses as much as digits as its factorization.

1389257501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 1389257501 is about 37272.7447473351. The cubic root of 1389257501 is about 1115.8202791767.

The spelling of 1389257501 in words is "one billion, three hundred eighty-nine million, two hundred fifty-seven thousand, five hundred one".