155240947 has 2 divisors, whose sum is σ = 155240948. Its totient is φ = 155240946.

The previous prime is 155240941. The next prime is 155240951. The reversal of 155240947 is 749042551.

It is a strong prime.

It is an emirp because it is prime and its reverse (749042551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155240947 - 2¹¹ = 155238899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155240941) 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, 77620473 + 77620474.

It is an arithmetic number, because the mean of its divisors is an integer number (77620474).

Almost surely, 2^155240947 is an apocalyptic number.

155240947 is a deficient number, since it is larger than the sum of its proper divisors (1).

155240947 is an equidigital number, since it uses as much as digits as its factorization.

155240947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 155240947 is about 12459.5725047050. The cubic root of 155240947 is about 537.4467336434.

The spelling of 155240947 in words is "one hundred fifty-five million, two hundred forty thousand, nine hundred forty-seven".