31285400229 has 60 divisors (see below), whose sum is σ = 48671489152. Its totient is φ = 20088469800.

The previous prime is 31285400197. The next prime is 31285400249. The reversal of 31285400229 is 92200458213.

It is a happy number.

31285400229 is a `hidden beast` number, since 3 + 1 + 28 + 5 + 400 + 229 = 666.

It is not a de Polignac number, because 31285400229 - 2⁵ = 31285400197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31285400193 and 31285400202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31285400249) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 148271934 + ... + 148272144.

Almost surely, 2^31285400229 is an apocalyptic number.

It is an amenable number.

31285400229 is a deficient number, since it is larger than the sum of its proper divisors (17386088923).

31285400229 is an frugal number, since it uses more digits than its factorization.

31285400229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 31285400229 in words is "thirty-one billion, two hundred eighty-five million, four hundred thousand, two hundred twenty-nine".