155012281 has 2 divisors, whose sum is σ = 155012282. Its totient is φ = 155012280.

The previous prime is 155012261. The next prime is 155012321. The reversal of 155012281 is 182210551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 66275881 = 9420^2 + 8141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155012281 is a prime.

It is a super-2 number, since 2×155012281² = 48057614521645922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155012261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77506140 + 77506141.

It is an arithmetic number, because the mean of its divisors is an integer number (77506141).

Almost surely, 2^155012281 is an apocalyptic number.

It is an amenable number.

155012281 is a deficient number, since it is larger than the sum of its proper divisors (1).

155012281 is an equidigital number, since it uses as much as digits as its factorization.

155012281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 155012281 is about 12450.3928050484. The cubic root of 155012281 is about 537.1827221452.

It can be divided in two parts, 1550 and 12281, that added together give a palindrome (13831).

The spelling of 155012281 in words is "one hundred fifty-five million, twelve thousand, two hundred eighty-one".