139670551 has 4 divisors (see below), whose sum is σ = 139725000. Its totient is φ = 139616104.

The previous prime is 139670533. The next prime is 139670563. The reversal of 139670551 is 155076931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155076931 = 3181 ⋅48751.

It is a cyclic number.

It is not a de Polignac number, because 139670551 - 2²⁵ = 106116119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139670551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139670581) 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, 23176 + ... + 28573.

It is an arithmetic number, because the mean of its divisors is an integer number (34931250).

Almost surely, 2^139670551 is an apocalyptic number.

139670551 is a deficient number, since it is larger than the sum of its proper divisors (54449).

139670551 is an equidigital number, since it uses as much as digits as its factorization.

139670551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54448.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 139670551 is about 11818.2296051481. The cubic root of 139670551 is about 518.8417898057.

The spelling of 139670551 in words is "one hundred thirty-nine million, six hundred seventy thousand, five hundred fifty-one".