139420551 has 8 divisors (see below), whose sum is σ = 190918384. Its totient is φ = 90434880.

The previous prime is 139420531. The next prime is 139420559. The reversal of 139420551 is 155024931.

139420551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139420551 - 2¹⁸ = 139158407 is a prime.

It is a super-2 number, since 2×139420551² = 38876180082287202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139420559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627910 + ... + 628131.

It is an arithmetic number, because the mean of its divisors is an integer number (23864798).

Almost surely, 2^139420551 is an apocalyptic number.

139420551 is a deficient number, since it is larger than the sum of its proper divisors (51497833).

139420551 is a wasteful number, since it uses less digits than its factorization.

139420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256081.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 139420551 is about 11807.6479876392. The cubic root of 139420551 is about 518.5320420593.

It can be divided in two parts, 1394 and 20551, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 139420551 in words is "one hundred thirty-nine million, four hundred twenty thousand, five hundred fifty-one".