1213250531 has 4 divisors (see below), whose sum is σ = 1214829000. Its totient is φ = 1211672064.

The previous prime is 1213250513. The next prime is 1213250537. The reversal of 1213250531 is 1350523121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213250531 - 2¹⁰ = 1213249507 is a prime.

It is a super-2 number, since 2×1213250531² = 2943953701943563922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213250497 and 1213250506.

It is not an unprimeable number, because it can be changed into a prime (1213250537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788081 + ... + 789618.

It is an arithmetic number, because the mean of its divisors is an integer number (303707250).

Almost surely, 2^1213250531 is an apocalyptic number.

1213250531 is a deficient number, since it is larger than the sum of its proper divisors (1578469).

1213250531 is an equidigital number, since it uses as much as digits as its factorization.

1213250531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578468.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1213250531 is about 34831.7460228453. The cubic root of 1213250531 is about 1066.5555910487. Note that the first 4 decimals are identical.

Adding to 1213250531 its reverse (1350523121), we get a palindrome (2563773652).

The spelling of 1213250531 in words is "one billion, two hundred thirteen million, two hundred fifty thousand, five hundred thirty-one".