139081513 has 4 divisors (see below), whose sum is σ = 139116880. Its totient is φ = 139046148.

The previous prime is 139081511. The next prime is 139081559. The reversal of 139081513 is 315180931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139081513 - 2¹ = 139081511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139081511) 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, 10923 + ... + 19936.

It is an arithmetic number, because the mean of its divisors is an integer number (34779220).

Almost surely, 2^139081513 is an apocalyptic number.

It is an amenable number.

139081513 is a deficient number, since it is larger than the sum of its proper divisors (35367).

139081513 is an equidigital number, since it uses as much as digits as its factorization.

139081513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35366.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 139081513 is about 11793.2825371056. The cubic root of 139081513 is about 518.1113848914. Note that the first 3 decimals are identical.

The spelling of 139081513 in words is "one hundred thirty-nine million, eighty-one thousand, five hundred thirteen".