139484939509 has 2 divisors, whose sum is σ = 139484939510. Its totient is φ = 139484939508.

The previous prime is 139484939491. The next prime is 139484939521. The reversal of 139484939509 is 905939484931.

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., 139336465284 + 148474225 = 373278^2 + 12185^2 .

It is a cyclic number.

It is not a de Polignac number, because 139484939509 - 2¹¹ = 139484937461 is a prime.

It is a super-2 number, since 2×139484939509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139484939579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69742469754 + 69742469755.

It is an arithmetic number, because the mean of its divisors is an integer number (69742469755).

Almost surely, 2^139484939509 is an apocalyptic number.

It is an amenable number.

139484939509 is a deficient number, since it is larger than the sum of its proper divisors (1).

139484939509 is an equidigital number, since it uses as much as digits as its factorization.

139484939509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37791360, while the sum is 64.

The spelling of 139484939509 in words is "one hundred thirty-nine billion, four hundred eighty-four million, nine hundred thirty-nine thousand, five hundred nine".