155801081 has 2 divisors, whose sum is σ = 155801082. Its totient is φ = 155801080.

The previous prime is 155801077. The next prime is 155801089. The reversal of 155801081 is 180108551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139122025 + 16679056 = 11795^2 + 4084^2 .

It is a cyclic number.

It is not a de Polignac number, because 155801081 - 2² = 155801077 is a prime.

It is a super-2 number, since 2×155801081² = 48547953681537122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155801089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77900540 + 77900541.

It is an arithmetic number, because the mean of its divisors is an integer number (77900541).

Almost surely, 2^155801081 is an apocalyptic number.

It is an amenable number.

155801081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155801081 is an equidigital number, since it uses as much as digits as its factorization.

155801081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 155801081 is about 12482.0303236292. The cubic root of 155801081 is about 538.0923554960.

It can be divided in two parts, 15580 and 1081, that added together give a palindrome (16661).

The spelling of 155801081 in words is "one hundred fifty-five million, eight hundred one thousand, eighty-one".