155434057 has 2 divisors, whose sum is σ = 155434058. Its totient is φ = 155434056.

The previous prime is 155434033. The next prime is 155434073. The reversal of 155434057 is 750434551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98823481 + 56610576 = 9941^2 + 7524^2 .

It is an emirp because it is prime and its reverse (750434551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155434057 - 2¹¹ = 155432009 is a prime.

It is not a weakly prime, because it can be changed into another prime (155434007) 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, 77717028 + 77717029.

It is an arithmetic number, because the mean of its divisors is an integer number (77717029).

Almost surely, 2^155434057 is an apocalyptic number.

It is an amenable number.

155434057 is a deficient number, since it is larger than the sum of its proper divisors (1).

155434057 is an equidigital number, since it uses as much as digits as its factorization.

155434057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 155434057 is about 12467.3195595525. The cubic root of 155434057 is about 537.6694913112.

It can be divided in two parts, 15543 and 4057, that added together give a square (19600 = 140²).

The spelling of 155434057 in words is "one hundred fifty-five million, four hundred thirty-four thousand, fifty-seven".