1213141251 has 16 divisors (see below), whose sum is σ = 1893685248. Its totient is φ = 676315200.

The previous prime is 1213141249. The next prime is 1213141261. The reversal of 1213141251 is 1521413121.

It is not a de Polignac number, because 1213141251 - 2¹ = 1213141249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1213141201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703635 + ... + 705356.

It is an arithmetic number, because the mean of its divisors is an integer number (118355328).

Almost surely, 2^1213141251 is an apocalyptic number.

1213141251 is a deficient number, since it is larger than the sum of its proper divisors (680543997).

1213141251 is a wasteful number, since it uses less digits than its factorization.

1213141251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409042.

The product of its digits is 240, while the sum is 21.

The square root of 1213141251 is about 34830.1773035969. The cubic root of 1213141251 is about 1066.5235677934.

Adding to 1213141251 its reverse (1521413121), we get a palindrome (2734554372).

The spelling of 1213141251 in words is "one billion, two hundred thirteen million, one hundred forty-one thousand, two hundred fifty-one".