135639551 has 2 divisors, whose sum is σ = 135639552. Its totient is φ = 135639550.

The previous prime is 135639547. The next prime is 135639563. The reversal of 135639551 is 155936531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135639551 - 2² = 135639547 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135639541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67819775 + 67819776.

It is an arithmetic number, because the mean of its divisors is an integer number (67819776).

Almost surely, 2^135639551 is an apocalyptic number.

135639551 is a deficient number, since it is larger than the sum of its proper divisors (1).

135639551 is an equidigital number, since it uses as much as digits as its factorization.

135639551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 38.

The square root of 135639551 is about 11646.4394129708. The cubic root of 135639551 is about 513.8015946589.

The spelling of 135639551 in words is "one hundred thirty-five million, six hundred thirty-nine thousand, five hundred fifty-one".