102331531449 has 27 divisors (see below), whose sum is σ = 171956106543. Its totient is φ = 58471322112.

The previous prime is 102331531409. The next prime is 102331531453. The reversal of 102331531449 is 944135133201.

The square root of 102331531449 is 319893.

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

102331531449 is a `hidden beast` number, since 1 + 0 + 2 + 331 + 5 + 314 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15796719225 + 86534812224 = 125685^2 + 294168^2 .

It is not a de Polignac number, because 102331531449 - 2²⁷ = 102197313721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102331531409) 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, 6710137 + ... + 6725369.

Almost surely, 2^102331531449 is an apocalyptic number.

102331531449 is the 319893-rd square number.

102331531449 is the 159947-th centered octagonal number.

It is an amenable number.

102331531449 is a deficient number, since it is larger than the sum of its proper divisors (69624575094).

102331531449 is an frugal number, since it uses more digits than its factorization.

102331531449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30486 (or 15243 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Multiplying 102331531449 by its sum of digits (36), we get a square (3683935132164 = 1919358²).

The spelling of 102331531449 in words is "one hundred two billion, three hundred thirty-one million, five hundred thirty-one thousand, four hundred forty-nine".