1438139161 has 4 divisors (see below), whose sum is σ = 1438215012. Its totient is φ = 1438063312.

The previous prime is 1438139159. The next prime is 1438139167. The reversal of 1438139161 is 1619318341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 851530761 + 586608400 = 29181^2 + 24220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438139161 - 2¹ = 1438139159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1438139161.

It is not an unprimeable number, because it can be changed into a prime (1438139167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18351 + ... + 56683.

It is an arithmetic number, because the mean of its divisors is an integer number (359553753).

Almost surely, 2^1438139161 is an apocalyptic number.

It is an amenable number.

1438139161 is a deficient number, since it is larger than the sum of its proper divisors (75851).

1438139161 is an equidigital number, since it uses as much as digits as its factorization.

1438139161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75850.

The product of its digits is 15552, while the sum is 37.

The square root of 1438139161 is about 37922.8052891660. The cubic root of 1438139161 is about 1128.7566037189.

The spelling of 1438139161 in words is "one billion, four hundred thirty-eight million, one hundred thirty-nine thousand, one hundred sixty-one".