1388625149 has 2 divisors, whose sum is σ = 1388625150. Its totient is φ = 1388625148.

The previous prime is 1388625097. The next prime is 1388625169. The reversal of 1388625149 is 9415268831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1037999524 + 350625625 = 32218^2 + 18725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388625149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388625169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694312574 + 694312575.

It is an arithmetic number, because the mean of its divisors is an integer number (694312575).

Almost surely, 2^1388625149 is an apocalyptic number.

It is an amenable number.

1388625149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388625149 is an equidigital number, since it uses as much as digits as its factorization.

1388625149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The square root of 1388625149 is about 37264.2610150799. The cubic root of 1388625149 is about 1115.6509565308.

The spelling of 1388625149 in words is "one billion, three hundred eighty-eight million, six hundred twenty-five thousand, one hundred forty-nine".