31473243649 has 9 divisors (see below), whose sum is σ = 32267063811. Its totient is φ = 30698507280.

The previous prime is 31473243647. The next prime is 31473243673. The reversal of 31473243649 is 94634237413.

The square root of 31473243649 is 177407.

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

It can be written as a sum of positive squares in only one way, i.e., 1516557249 + 29956686400 = 38943^2 + 173080^2 .

It is not a de Polignac number, because 31473243649 - 2¹ = 31473243647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31473243599 and 31473243608.

It is not an unprimeable number, because it can be changed into a prime (31473243643) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7271524 + ... + 7275850.

Almost surely, 2^31473243649 is an apocalyptic number.

31473243649 is the 177407-th square number.

31473243649 is the 88704-th centered octagonal number.

It is an amenable number.

31473243649 is a deficient number, since it is larger than the sum of its proper divisors (793820162).

31473243649 is an frugal number, since it uses more digits than its factorization.

31473243649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8736 (or 4368 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 46.

The spelling of 31473243649 in words is "thirty-one billion, four hundred seventy-three million, two hundred forty-three thousand, six hundred forty-nine".