155631841 has 4 divisors (see below), whose sum is σ = 156676500. Its totient is φ = 154587184.

The previous prime is 155631829. The next prime is 155631851. The reversal of 155631841 is 148136551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 148136551 = 59 ⋅2510789.

It can be written as a sum of positive squares in 2 ways, for example, as 103734225 + 51897616 = 10185^2 + 7204^2 .

It is a cyclic number.

It is not a de Polignac number, because 155631841 - 2¹³ = 155623649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155631797 and 155631806.

It is not an unprimeable number, because it can be changed into a prime (155631851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522106 + ... + 522403.

It is an arithmetic number, because the mean of its divisors is an integer number (39169125).

Almost surely, 2^155631841 is an apocalyptic number.

It is an amenable number.

155631841 is a deficient number, since it is larger than the sum of its proper divisors (1044659).

155631841 is a wasteful number, since it uses less digits than its factorization.

155631841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044658.

The product of its digits is 14400, while the sum is 34.

The square root of 155631841 is about 12475.2491357888. The cubic root of 155631841 is about 537.8974493941.

The spelling of 155631841 in words is "one hundred fifty-five million, six hundred thirty-one thousand, eight hundred forty-one".