1639120537 has 2 divisors, whose sum is σ = 1639120538. Its totient is φ = 1639120536.

The previous prime is 1639120523. The next prime is 1639120579. The reversal of 1639120537 is 7350219361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1061391241 + 577729296 = 32579^2 + 24036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639120537 - 2¹¹ = 1639118489 is a prime.

It is a super-2 number, since 2×1639120537² = 5373432269630336738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1639120496 and 1639120505.

It is not a weakly prime, because it can be changed into another prime (1639120037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819560268 + 819560269.

It is an arithmetic number, because the mean of its divisors is an integer number (819560269).

Almost surely, 2^1639120537 is an apocalyptic number.

It is an amenable number.

1639120537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639120537 is an equidigital number, since it uses as much as digits as its factorization.

1639120537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 1639120537 is about 40486.0536110893. The cubic root of 1639120537 is about 1179.0628720108.

Adding to 1639120537 its reverse (7350219361), we get a palindrome (8989339898).

The spelling of 1639120537 in words is "one billion, six hundred thirty-nine million, one hundred twenty thousand, five hundred thirty-seven".