31202749449 has 45 divisors (see below), whose sum is σ = 49241538423. Its totient is φ = 19687922208.

The previous prime is 31202749447. The next prime is 31202749451. The reversal of 31202749449 is 94494720213.

The square root of 31202749449 is 176643.

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

It is an interprime number because it is at equal distance from previous prime (31202749447) and next prime (31202749451).

It can be written as a sum of positive squares in only one way, i.e., 30124809225 + 1077940224 = 173565^2 + 32832^2 .

It is not a de Polignac number, because 31202749449 - 2¹ = 31202749447 is a prime.

It is a super-2 number, since 2×31202749449² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31202749447) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 30205437 + ... + 30206469.

Almost surely, 2^31202749449 is an apocalyptic number.

31202749449 is the 176643-rd square number.

31202749449 is the 88322-nd centered octagonal number.

It is an amenable number.

31202749449 is a deficient number, since it is larger than the sum of its proper divisors (18038788974).

31202749449 is an frugal number, since it uses more digits than its factorization.

31202749449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 31202749449 in words is "thirty-one billion, two hundred two million, seven hundred forty-nine thousand, four hundred forty-nine".