139533913 has 4 divisors (see below), whose sum is σ = 139667728. Its totient is φ = 139400100.

The previous prime is 139533887. The next prime is 139533923. The reversal of 139533913 is 319335931.

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 139533913 - 2¹⁷ = 139402841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139533923) 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, 65331 + ... + 67432.

It is an arithmetic number, because the mean of its divisors is an integer number (34916932).

Almost surely, 2^139533913 is an apocalyptic number.

It is an amenable number.

139533913 is a deficient number, since it is larger than the sum of its proper divisors (133815).

139533913 is a wasteful number, since it uses less digits than its factorization.

139533913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133814.

The product of its digits is 32805, while the sum is 37.

The square root of 139533913 is about 11812.4473755442. The cubic root of 139533913 is about 518.6725424002.

The spelling of 139533913 in words is "one hundred thirty-nine million, five hundred thirty-three thousand, nine hundred thirteen".