155531430 has 48 divisors (see below), whose sum is σ = 413796240. Its totient is φ = 40509504.

The previous prime is 155531407. The next prime is 155531443. The reversal of 155531430 is 34135551.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155531394 and 155531403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16225 + ... + 23964.

It is an arithmetic number, because the mean of its divisors is an integer number (8620755).

Almost surely, 2^155531430 is an apocalyptic number.

155531430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155531430 is an abundant number, since it is smaller than the sum of its proper divisors (258264810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155531430 is a wasteful number, since it uses less digits than its factorization.

155531430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40245 (or 40242 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 155531430 is about 12471.2240778522. The cubic root of 155531430 is about 537.7817437642.

Adding to 155531430 its reverse (34135551), we get a palindrome (189666981).

It can be divided in two parts, 155531 and 430, that added together give a triangular number (155961 = T₅₅₈).

The spelling of 155531430 in words is "one hundred fifty-five million, five hundred thirty-one thousand, four hundred thirty".