155631023 has 4 divisors (see below), whose sum is σ = 160997640. Its totient is φ = 150264408.

The previous prime is 155630983. The next prime is 155631079. The reversal of 155631023 is 320136551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155631023 - 2²⁰ = 154582447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155630983 and 155631001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155631323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2683265 + ... + 2683322.

It is an arithmetic number, because the mean of its divisors is an integer number (40249410).

Almost surely, 2^155631023 is an apocalyptic number.

155631023 is a deficient number, since it is larger than the sum of its proper divisors (5366617).

155631023 is an equidigital number, since it uses as much as digits as its factorization.

155631023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366616.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 155631023 is about 12475.2163508294. The cubic root of 155631023 is about 537.8965069972.

Adding to 155631023 its reverse (320136551), we get a palindrome (475767574).

The spelling of 155631023 in words is "one hundred fifty-five million, six hundred thirty-one thousand, twenty-three".