245531139 has 32 divisors (see below), whose sum is σ = 394398720. Its totient is φ = 132892032.

The previous prime is 245531137. The next prime is 245531159. The reversal of 245531139 is 931135542.

It is not a de Polignac number, because 245531139 - 2¹ = 245531137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245531137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28474 + ... + 36080.

It is an arithmetic number, because the mean of its divisors is an integer number (12324960).

Almost surely, 2^245531139 is an apocalyptic number.

245531139 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

245531139 is a deficient number, since it is larger than the sum of its proper divisors (148867581).

245531139 is a wasteful number, since it uses less digits than its factorization.

245531139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699.

The product of its digits is 16200, while the sum is 33.

The square root of 245531139 is about 15669.4332699048. The cubic root of 245531139 is about 626.1843263230.

The spelling of 245531139 in words is "two hundred forty-five million, five hundred thirty-one thousand, one hundred thirty-nine".