31486878474489 has 27 divisors (see below), whose sum is σ = 46171653833487. Its totient is φ = 20677209349104.

The previous prime is 31486878474439. The next prime is 31486878474521. The reversal of 31486878474489 is 98447487868413.

The square root of 31486878474489 is 5611317.

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

31486878474489 is a `hidden beast` number, since 3 + 1 + 4 + 8 + 68 + 7 + 8 + 4 + 74 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29879287778025 + 1607590696464 = 5466195^2 + 1267908^2 .

It is not a de Polignac number, because 31486878474489 - 2³³ = 31478288539897 is a prime.

It is a super-2 number, since 2×31486878474489² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31486878474419) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1127860759 + ... + 1127888675.

Almost surely, 2^{31486878474489} is an apocalyptic number.

31486878474489 is the 5611317-th square number.

31486878474489 is the 2805659-th centered octagonal number.

It is an amenable number.

31486878474489 is a deficient number, since it is larger than the sum of its proper divisors (14684775358998).

31486878474489 is an frugal number, since it uses more digits than its factorization.

31486878474489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55974 (or 27987 counting only the distinct ones).

The product of its digits is 8323596288, while the sum is 81.

The spelling of 31486878474489 in words is "thirty-one trillion, four hundred eighty-six billion, eight hundred seventy-eight million, four hundred seventy-four thousand, four hundred eighty-nine".