139646458249 has 3 divisors (see below), whose sum is σ = 139646831943. Its totient is φ = 139646084556.

The previous prime is 139646458207. The next prime is 139646458297. The reversal of 139646458249 is 942854646931.

The square root of 139646458249 is 373693.

It is a perfect power (a square), and thus also a powerful 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 only one way, i.e., 92267100025 + 47379358224 = 303755^2 + 217668^2 .

It is not a de Polignac number, because 139646458249 - 2¹⁵ = 139646425481 is a prime.

It is a super-2 number, since 2×139646458249² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139646458349) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 186847 + ... + 560539.

It is an arithmetic number, because the mean of its divisors is an integer number (46548943981).

Almost surely, 2^139646458249 is an apocalyptic number.

139646458249 is the 373693-rd square number.

139646458249 is the 186847-th centered octagonal number.

It is an amenable number.

139646458249 is a deficient number, since it is larger than the sum of its proper divisors (373694).

139646458249 is an frugal number, since it uses more digits than its factorization.

139646458249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747386 (or 373693 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 61.

The spelling of 139646458249 in words is "one hundred thirty-nine billion, six hundred forty-six million, four hundred fifty-eight thousand, two hundred forty-nine".