31031288649 has 75 divisors (see below), whose sum is σ = 49807632567. Its totient is φ = 19253255472.

The previous prime is 31031288621. The next prime is 31031288653. The reversal of 31031288649 is 94688213013.

The square root of 31031288649 is 176157.

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., 27767223225 + 3264065424 = 166635^2 + 57132^2 .

It is not a de Polignac number, because 31031288649 - 2¹⁹ = 31030764361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31031288609) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 838683459 + ... + 838683495.

Almost surely, 2^31031288649 is an apocalyptic number.

31031288649 is the 176157-th square number.

31031288649 is the 88079-th centered octagonal number.

It is an amenable number.

31031288649 is a deficient number, since it is larger than the sum of its proper divisors (18776343918).

31031288649 is an frugal number, since it uses more digits than its factorization.

31031288649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 31031288649 in words is "thirty-one billion, thirty-one million, two hundred eighty-eight thousand, six hundred forty-nine".