139520491 has 16 divisors (see below), whose sum is σ = 158708736. Its totient is φ = 121500000.

The previous prime is 139520483. The next prime is 139520497. The reversal of 139520491 is 194025931.

139520491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 6-Lehmer number, since φ(139520491) divides (139520491-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 139520491 - 2³ = 139520483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139520497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32416 + ... + 36466.

It is an arithmetic number, because the mean of its divisors is an integer number (9919296).

Almost surely, 2^139520491 is an apocalyptic number.

139520491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139520491 is a deficient number, since it is larger than the sum of its proper divisors (19188245).

139520491 is a wasteful number, since it uses less digits than its factorization.

139520491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 139520491 is about 11811.8792323660. The cubic root of 139520491 is about 518.6559112077.

The spelling of 139520491 in words is "one hundred thirty-nine million, five hundred twenty thousand, four hundred ninety-one".