155361281 has 2 divisors, whose sum is σ = 155361282. Its totient is φ = 155361280.

The previous prime is 155361253. The next prime is 155361293. The reversal of 155361281 is 182163551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155127025 + 234256 = 12455^2 + 484^2 .

It is a cyclic number.

It is not a de Polignac number, because 155361281 - 2¹⁴ = 155344897 is a prime.

It is a super-2 number, since 2×155361281² = 48274255267921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155361211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77680640 + 77680641.

It is an arithmetic number, because the mean of its divisors is an integer number (77680641).

Almost surely, 2^155361281 is an apocalyptic number.

It is an amenable number.

155361281 is a deficient number, since it is larger than the sum of its proper divisors (1).

155361281 is an equidigital number, since it uses as much as digits as its factorization.

155361281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 32.

The square root of 155361281 is about 12464.4005471583. The cubic root of 155361281 is about 537.5855638798.

The spelling of 155361281 in words is "one hundred fifty-five million, three hundred sixty-one thousand, two hundred eighty-one".