139616551 has 4 divisors (see below), whose sum is σ = 140093352. Its totient is φ = 139139752.

The previous prime is 139616549. The next prime is 139616557. The reversal of 139616551 is 155616931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139616551 - 2¹ = 139616549 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 139616551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139616557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237961 + ... + 238546.

It is an arithmetic number, because the mean of its divisors is an integer number (35023338).

Almost surely, 2^139616551 is an apocalyptic number.

139616551 is a deficient number, since it is larger than the sum of its proper divisors (476801).

139616551 is an equidigital number, since it uses as much as digits as its factorization.

139616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476800.

The product of its digits is 24300, while the sum is 37.

The square root of 139616551 is about 11815.9447781377. The cubic root of 139616551 is about 518.7749156078.

The spelling of 139616551 in words is "one hundred thirty-nine million, six hundred sixteen thousand, five hundred fifty-one".