139553551 has 2 divisors, whose sum is σ = 139553552. Its totient is φ = 139553550.

The previous prime is 139553507. The next prime is 139553593. The reversal of 139553551 is 155355931.

It is a strong prime.

It is an emirp because it is prime and its reverse (155355931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139553551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139553551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139554551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69776775 + 69776776.

It is an arithmetic number, because the mean of its divisors is an integer number (69776776).

Almost surely, 2^139553551 is an apocalyptic number.

139553551 is a deficient number, since it is larger than the sum of its proper divisors (1).

139553551 is an equidigital number, since it uses as much as digits as its factorization.

139553551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50625, while the sum is 37.

The square root of 139553551 is about 11813.2785880974. The cubic root of 139553551 is about 518.6968739130.

It can be divided in two parts, 1395 and 53551, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 139553551 in words is "one hundred thirty-nine million, five hundred fifty-three thousand, five hundred fifty-one".