1138661625 has 16 divisors (see below), whose sum is σ = 1894733568. Its totient is φ = 607286000.

The previous prime is 1138661603. The next prime is 1138661627. The reversal of 1138661625 is 5261668311.

It is not a de Polignac number, because 1138661625 - 2⁶ = 1138661561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138661627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1517841 + ... + 1518590.

It is an arithmetic number, because the mean of its divisors is an integer number (118420848).

Almost surely, 2^1138661625 is an apocalyptic number.

1138661625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1138661625 is a deficient number, since it is larger than the sum of its proper divisors (756071943).

1138661625 is an equidigital number, since it uses as much as digits as its factorization.

1138661625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036449 (or 3036439 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 1138661625 is about 33744.0605884947. The cubic root of 1138661625 is about 1044.2349581639.

The spelling of 1138661625 in words is "one billion, one hundred thirty-eight million, six hundred sixty-one thousand, six hundred twenty-five".