139452481 has 15 divisors (see below), whose sum is σ = 163362723. Its totient is φ = 119034720.

The previous prime is 139452463. The next prime is 139452491. The reversal of 139452481 is 184254931.

The square root of 139452481 is 11809.

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., 104878081 + 34574400 = 10241^2 + 5880^2 .

It is not a de Polignac number, because 139452481 - 2¹⁵ = 139419713 is a prime.

It is a super-2 number, since 2×139452481² = 38893988914110722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139452481.

It is not an unprimeable number, because it can be changed into a prime (139452491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 578521 + ... + 578761.

Almost surely, 2^139452481 is an apocalyptic number.

139452481 is the 11809-th square number.

139452481 is the 5905-th centered octagonal number.

It is an amenable number.

139452481 is a deficient number, since it is larger than the sum of its proper divisors (23910242).

139452481 is an frugal number, since it uses more digits than its factorization.

139452481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 248 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The cubic root of 139452481 is about 518.5716236566.

The spelling of 139452481 in words is "one hundred thirty-nine million, four hundred fifty-two thousand, four hundred eighty-one".