139962281 has 4 divisors (see below), whose sum is σ = 140573700. Its totient is φ = 139350864.

The previous prime is 139962269. The next prime is 139962299. The reversal of 139962281 is 182269931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182269931 = 653 ⋅279127.

It can be written as a sum of positive squares in 2 ways, for example, as 94264681 + 45697600 = 9709^2 + 6760^2 .

It is a cyclic number.

It is not a de Polignac number, because 139962281 - 2⁶ = 139962217 is a prime.

It is a super-2 number, since 2×139962281² = 39178880205445922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139962181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305366 + ... + 305823.

It is an arithmetic number, because the mean of its divisors is an integer number (35143425).

Almost surely, 2^139962281 is an apocalyptic number.

It is an amenable number.

139962281 is a deficient number, since it is larger than the sum of its proper divisors (611419).

139962281 is an equidigital number, since it uses as much as digits as its factorization.

139962281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611418.

The product of its digits is 46656, while the sum is 41.

The square root of 139962281 is about 11830.5655401591. The cubic root of 139962281 is about 519.2027736906.

The spelling of 139962281 in words is "one hundred thirty-nine million, nine hundred sixty-two thousand, two hundred eighty-one".