920320139 has 2 divisors, whose sum is σ = 920320140. Its totient is φ = 920320138.

The previous prime is 920320127. The next prime is 920320147. The reversal of 920320139 is 931023029.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920320139 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (920320199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460160069 + 460160070.

It is an arithmetic number, because the mean of its divisors is an integer number (460160070).

Almost surely, 2^920320139 is an apocalyptic number.

920320139 is a deficient number, since it is larger than the sum of its proper divisors (1).

920320139 is an equidigital number, since it uses as much as digits as its factorization.

920320139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 920320139 is about 30336.7786523223. The cubic root of 920320139 is about 972.7016260397.

The spelling of 920320139 in words is "nine hundred twenty million, three hundred twenty thousand, one hundred thirty-nine".