155143631 has 4 divisors (see below), whose sum is σ = 158927664. Its totient is φ = 151359600.

The previous prime is 155143619. The next prime is 155143633. The reversal of 155143631 is 136341551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136341551 = 97 ⋅1405583.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155143631 is a prime.

It is a super-2 number, since 2×155143631² = 48139092479728322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155143594 and 155143603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155143633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1891955 + ... + 1892036.

It is an arithmetic number, because the mean of its divisors is an integer number (39731916).

Almost surely, 2^155143631 is an apocalyptic number.

155143631 is a deficient number, since it is larger than the sum of its proper divisors (3784033).

155143631 is an equidigital number, since it uses as much as digits as its factorization.

155143631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784032.

The product of its digits is 5400, while the sum is 29.

The square root of 155143631 is about 12455.6666220640. Note that the first 4 decimals coincide. The cubic root of 155143631 is about 537.3344069666.

The spelling of 155143631 in words is "one hundred fifty-five million, one hundred forty-three thousand, six hundred thirty-one".