155408947 has 2 divisors, whose sum is σ = 155408948. Its totient is φ = 155408946.

The previous prime is 155408899. The next prime is 155408959. The reversal of 155408947 is 749804551.

It is a strong prime.

It is an emirp because it is prime and its reverse (749804551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155408947 is a prime.

It is not a weakly prime, because it can be changed into another prime (155408977) 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, 77704473 + 77704474.

It is an arithmetic number, because the mean of its divisors is an integer number (77704474).

Almost surely, 2^155408947 is an apocalyptic number.

155408947 is a deficient number, since it is larger than the sum of its proper divisors (1).

155408947 is an equidigital number, since it uses as much as digits as its factorization.

155408947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 155408947 is about 12466.3124860562. The cubic root of 155408947 is about 537.6405366787.

The spelling of 155408947 in words is "one hundred fifty-five million, four hundred eight thousand, nine hundred forty-seven".