139362491 has 4 divisors (see below), whose sum is σ = 141647184. Its totient is φ = 137077800.

The previous prime is 139362467. The next prime is 139362499. The reversal of 139362491 is 194263931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194263931 = 59 ⋅3292609.

It is a cyclic number.

It is not a de Polignac number, because 139362491 - 2⁶ = 139362427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139362499) 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, 1142255 + ... + 1142376.

It is an arithmetic number, because the mean of its divisors is an integer number (35411796).

Almost surely, 2^139362491 is an apocalyptic number.

139362491 is a deficient number, since it is larger than the sum of its proper divisors (2284693).

139362491 is an equidigital number, since it uses as much as digits as its factorization.

139362491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284692.

The product of its digits is 34992, while the sum is 38.

The square root of 139362491 is about 11805.1891556214. The cubic root of 139362491 is about 518.4600532690.

The spelling of 139362491 in words is "one hundred thirty-nine million, three hundred sixty-two thousand, four hundred ninety-one".