231387550 has 12 divisors (see below), whose sum is σ = 430380936. Its totient is φ = 92555000.

The previous prime is 231387547. The next prime is 231387553. The reversal of 231387550 is 55783132.

It is an interprime number because it is at equal distance from previous prime (231387547) and next prime (231387553).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231387553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2313826 + ... + 2313925.

It is an arithmetic number, because the mean of its divisors is an integer number (35865078).

Almost surely, 2^231387550 is an apocalyptic number.

231387550 is a deficient number, since it is larger than the sum of its proper divisors (198993386).

231387550 is a wasteful number, since it uses less digits than its factorization.

231387550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4627763 (or 4627758 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 231387550 is about 15211.4282695610. The cubic root of 231387550 is about 613.9221873685.

The spelling of 231387550 in words is "two hundred thirty-one million, three hundred eighty-seven thousand, five hundred fifty".