31752745249 has 9 divisors (see below), whose sum is σ = 32206866969. Its totient is φ = 31304946240.

The previous prime is 31752745247. The next prime is 31752745273. The reversal of 31752745249 is 94254725713.

The square root of 31752745249 is 178193.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4846248225 + 26906497024 = 69615^2 + 164032^2 .

It is not a de Polignac number, because 31752745249 - 2¹ = 31752745247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31752745247) 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, 13006869 + ... + 13009309.

Almost surely, 2^31752745249 is an apocalyptic number.

31752745249 is the 178193-rd square number.

31752745249 is the 89097-th centered octagonal number.

It is an amenable number.

31752745249 is a deficient number, since it is larger than the sum of its proper divisors (454121720).

31752745249 is an frugal number, since it uses more digits than its factorization.

31752745249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028 (or 2514 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 49.

Multiplying 31752745249 by its sum of digits (49), we get a square (1555884517201 = 1247351²).

The spelling of 31752745249 in words is "thirty-one billion, seven hundred fifty-two million, seven hundred forty-five thousand, two hundred forty-nine".