231641550 has 144 divisors (see below), whose sum is σ = 717430272. Its totient is φ = 52488000.

The previous prime is 231641537. The next prime is 231641563. The reversal of 231641550 is 55146132.

It is an interprime number because it is at equal distance from previous prime (231641537) and next prime (231641563).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 475407 + ... + 475893.

Almost surely, 2^231641550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231641550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358715136).

231641550 is an abundant number, since it is smaller than the sum of its proper divisors (485788722).

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

231641550 is a wasteful number, since it uses less digits than its factorization.

231641550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 231641550 is about 15219.7749654849. The cubic root of 231641550 is about 614.1467445554.

Adding to 231641550 its reverse (55146132), we get a palindrome (286787682).

The spelling of 231641550 in words is "two hundred thirty-one million, six hundred forty-one thousand, five hundred fifty".