1311512421 has 8 divisors (see below), whose sum is σ = 1750351264. Its totient is φ = 873507600.

The previous prime is 1311512351. The next prime is 1311512429. The reversal of 1311512421 is 1242151131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311512421 - 2²¹ = 1309415269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311512429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204826 + ... + 211131.

It is an arithmetic number, because the mean of its divisors is an integer number (218793908).

Almost surely, 2^1311512421 is an apocalyptic number.

It is an amenable number.

1311512421 is a deficient number, since it is larger than the sum of its proper divisors (438838843).

1311512421 is a wasteful number, since it uses less digits than its factorization.

1311512421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417011.

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

The square root of 1311512421 is about 36214.8094154864. The cubic root of 1311512421 is about 1094.6051052014.

Adding to 1311512421 its reverse (1242151131), we get a palindrome (2553663552).

The spelling of 1311512421 in words is "one billion, three hundred eleven million, five hundred twelve thousand, four hundred twenty-one".