1213406401 has 4 divisors (see below), whose sum is σ = 1230496704. Its totient is φ = 1196316100.

The previous prime is 1213406339. The next prime is 1213406407. The reversal of 1213406401 is 1046043121.

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 1213406401 - 2⁷ = 1213406273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213406407) 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, 8545045 + ... + 8545186.

It is an arithmetic number, because the mean of its divisors is an integer number (307624176).

Almost surely, 2^1213406401 is an apocalyptic number.

It is an amenable number.

1213406401 is a deficient number, since it is larger than the sum of its proper divisors (17090303).

1213406401 is an equidigital number, since it uses as much as digits as its factorization.

1213406401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17090302.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1213406401 is about 34833.9834213660. The cubic root of 1213406401 is about 1066.6012636440.

Adding to 1213406401 its reverse (1046043121), we get a palindrome (2259449522).

The spelling of 1213406401 in words is "one billion, two hundred thirteen million, four hundred six thousand, four hundred one".