1243431401 has 4 divisors (see below), whose sum is σ = 1249680000. Its totient is φ = 1237182804.

The previous prime is 1243431377. The next prime is 1243431407. The reversal of 1243431401 is 1041343421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1041343421 = 47 ⋅22156243.

It is a cyclic number.

It is not a de Polignac number, because 1243431401 - 2⁶ = 1243431337 is a prime.

It is a super-2 number, since 2×1243431401² = 3092243297985645602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243431407) 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, 3124001 + ... + 3124398.

It is an arithmetic number, because the mean of its divisors is an integer number (312420000).

Almost surely, 2^1243431401 is an apocalyptic number.

It is an amenable number.

1243431401 is a deficient number, since it is larger than the sum of its proper divisors (6248599).

1243431401 is an equidigital number, since it uses as much as digits as its factorization.

1243431401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248598.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1243431401 is about 35262.3226829998. The cubic root of 1243431401 is about 1075.3271478801.

Adding to 1243431401 its reverse (1041343421), we get a palindrome (2284774822).

The spelling of 1243431401 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, four hundred one".