1213404131 has 16 divisors (see below), whose sum is σ = 1247920128. Its totient is φ = 1179463200.

The previous prime is 1213404113. The next prime is 1213404133. The reversal of 1213404131 is 1314043121.

It is a cyclic number.

It is not a de Polignac number, because 1213404131 - 2⁶ = 1213404067 is a prime.

It is a super-2 number, since 2×1213404131² = 2944699170255730322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213404133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3167966 + ... + 3168348.

It is an arithmetic number, because the mean of its divisors is an integer number (77995008).

Almost surely, 2^1213404131 is an apocalyptic number.

1213404131 is a deficient number, since it is larger than the sum of its proper divisors (34515997).

1213404131 is a wasteful number, since it uses less digits than its factorization.

1213404131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1213404131 is about 34833.9508382268. The cubic root of 1213404131 is about 1066.6005985229.

Adding to 1213404131 its reverse (1314043121), we get a palindrome (2527447252).

The spelling of 1213404131 in words is "one billion, two hundred thirteen million, four hundred four thousand, one hundred thirty-one".