155136749 has 2 divisors, whose sum is σ = 155136750. Its totient is φ = 155136748.

The previous prime is 155136719. The next prime is 155136763. The reversal of 155136749 is 947631551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147792649 + 7344100 = 12157^2 + 2710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155136749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155136719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77568374 + 77568375.

It is an arithmetic number, because the mean of its divisors is an integer number (77568375).

Almost surely, 2^155136749 is an apocalyptic number.

It is an amenable number.

155136749 is a deficient number, since it is larger than the sum of its proper divisors (1).

155136749 is an equidigital number, since it uses as much as digits as its factorization.

155136749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 155136749 is about 12455.3903591979. The cubic root of 155136749 is about 537.3264616623.

The spelling of 155136749 in words is "one hundred fifty-five million, one hundred thirty-six thousand, seven hundred forty-nine".