31123403401 has 4 divisors (see below), whose sum is σ = 31126280400. Its totient is φ = 31120526404.

The previous prime is 31123403393. The next prime is 31123403411. The reversal of 31123403401 is 10430432113.

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: 10430432113 = 4909 ⋅2124757.

It is a cyclic number.

It is not a de Polignac number, because 31123403401 - 2³ = 31123403393 is a prime.

It is a super-2 number, since 2×31123403401² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123403411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1422211 + ... + 1443928.

It is an arithmetic number, because the mean of its divisors is an integer number (7781570100).

Almost surely, 2^31123403401 is an apocalyptic number.

It is an amenable number.

31123403401 is a deficient number, since it is larger than the sum of its proper divisors (2876999).

31123403401 is a wasteful number, since it uses less digits than its factorization.

31123403401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876998.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31123403401 its reverse (10430432113), we get a palindrome (41553835514).

The spelling of 31123403401 in words is "thirty-one billion, one hundred twenty-three million, four hundred three thousand, four hundred one".