1213550 has 24 divisors (see below), whose sum is σ = 2432136. Its totient is φ = 447840.

The previous prime is 1213547. The next prime is 1213561. The reversal of 1213550 is 553121.

1213550 = T₂₉₉ + T₃₀₀ + ... + T₃₂₃.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (101339).

2^1213550 is an apocalyptic number.

1213550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213550 is an abundant number, since it is smaller than the sum of its proper divisors (1218586).

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

1213550 is a wasteful number, since it uses less digits than its factorization.

1213550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892 (or 1887 counting only the distinct ones).

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

The square root of 1213550 is about 1101.6124545411. The cubic root of 1213550 is about 106.6643337163.

Adding to 1213550 its reverse (553121), we get a palindrome (1766671).

The spelling of 1213550 in words is "one million, two hundred thirteen thousand, five hundred fifty".