1231550 has 12 divisors (see below), whose sum is σ = 2290776. Its totient is φ = 492600.

The previous prime is 1231547. The next prime is 1231553. The reversal of 1231550 is 551321.

It is an interprime number because it is at equal distance from previous prime (1231547) and next prime (1231553).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231553) 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, 12266 + ... + 12365.

It is an arithmetic number, because the mean of its divisors is an integer number (190898).

2^1231550 is an apocalyptic number.

1231550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231550 is a deficient number, since it is larger than the sum of its proper divisors (1059226).

1231550 is a wasteful number, since it uses less digits than its factorization.

1231550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24643 (or 24638 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1231550 is about 1109.7522245979. The cubic root of 1231550 is about 107.1891144178.

Adding to 1231550 its reverse (551321), we get a palindrome (1782871).

The spelling of 1231550 in words is "one million, two hundred thirty-one thousand, five hundred fifty".