155801131 has 2 divisors, whose sum is σ = 155801132. Its totient is φ = 155801130.

The previous prime is 155801119. The next prime is 155801161. The reversal of 155801131 is 131108551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155801131 - 2¹⁵ = 155768363 is a prime.

It is a super-2 number, since 2×155801131² = 48547984841758322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155801096 and 155801105.

It is not a weakly prime, because it can be changed into another prime (155801101) 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, 77900565 + 77900566.

It is an arithmetic number, because the mean of its divisors is an integer number (77900566).

Almost surely, 2^155801131 is an apocalyptic number.

155801131 is a deficient number, since it is larger than the sum of its proper divisors (1).

155801131 is an equidigital number, since it uses as much as digits as its factorization.

155801131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 25.

The square root of 155801131 is about 12482.0323265084. The cubic root of 155801131 is about 538.0924130579.

Adding to 155801131 its reverse (131108551), we get a palindrome (286909682).

The spelling of 155801131 in words is "one hundred fifty-five million, eight hundred one thousand, one hundred thirty-one".