1213274791 has 4 divisors (see below), whose sum is σ = 1214159832. Its totient is φ = 1212389752.

The previous prime is 1213274737. The next prime is 1213274833. The reversal of 1213274791 is 1974723121.

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 1213274791 - 2¹³ = 1213266599 is a prime.

It is a super-4 number, since 4×1213274791⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213274791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213274291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440461 + ... + 443206.

It is an arithmetic number, because the mean of its divisors is an integer number (303539958).

Almost surely, 2^1213274791 is an apocalyptic number.

1213274791 is a deficient number, since it is larger than the sum of its proper divisors (885041).

1213274791 is an equidigital number, since it uses as much as digits as its factorization.

1213274791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885040.

The product of its digits is 21168, while the sum is 37.

The square root of 1213274791 is about 34832.0942666386. The cubic root of 1213274791 is about 1066.5626999037.

The spelling of 1213274791 in words is "one billion, two hundred thirteen million, two hundred seventy-four thousand, seven hundred ninety-one".