31285473129 has 21 divisors (see below), whose sum is σ = 46913913229. Its totient is φ = 20853798300.

The previous prime is 31285473127. The next prime is 31285473137. The reversal of 31285473129 is 92137458213.

It is a happy number.

The square root of 31285473129 is 176877.

It is a perfect power (a square), and thus also a powerful number.

31285473129 is a `hidden beast` number, since 31 + 28 + 5 + 473 + 129 = 666.

It is not a de Polignac number, because 31285473129 - 2¹ = 31285473127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31285473127) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 4772404 + ... + 4778954.

Almost surely, 2^31285473129 is an apocalyptic number.

31285473129 is the 176877-th square number.

31285473129 is the 88439-th centered octagonal number.

It is an amenable number.

31285473129 is a deficient number, since it is larger than the sum of its proper divisors (15628440100).

31285473129 is an frugal number, since it uses more digits than its factorization.

31285473129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13120 (or 6554 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 31285473129 in words is "thirty-one billion, two hundred eighty-five million, four hundred seventy-three thousand, one hundred twenty-nine".