1213668481 has 4 divisors (see below), whose sum is σ = 1217571264. Its totient is φ = 1209765700.

The previous prime is 1213668479. The next prime is 1213668493. The reversal of 1213668481 is 1848663121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213668481 - 2¹ = 1213668479 is a prime.

It is a super-2 number, since 2×1213668481² = 2945982363545694722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213668431) 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, 1950925 + ... + 1951546.

It is an arithmetic number, because the mean of its divisors is an integer number (304392816).

Almost surely, 2^1213668481 is an apocalyptic number.

It is an amenable number.

1213668481 is a deficient number, since it is larger than the sum of its proper divisors (3902783).

1213668481 is an equidigital number, since it uses as much as digits as its factorization.

1213668481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902782.

The product of its digits is 55296, while the sum is 40.

The square root of 1213668481 is about 34837.7450619296. The cubic root of 1213668481 is about 1066.6780487826.

The spelling of 1213668481 in words is "one billion, two hundred thirteen million, six hundred sixty-eight thousand, four hundred eighty-one".