161012539 has 2 divisors, whose sum is σ = 161012540. Its totient is φ = 161012538.

The previous prime is 161012473. The next prime is 161012563. The reversal of 161012539 is 935210161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161012539 - 2¹¹ = 161010491 is a prime.

It is not a weakly prime, because it can be changed into another prime (161012639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80506269 + 80506270.

It is an arithmetic number, because the mean of its divisors is an integer number (80506270).

Almost surely, 2^161012539 is an apocalyptic number.

161012539 is a deficient number, since it is larger than the sum of its proper divisors (1).

161012539 is an equidigital number, since it uses as much as digits as its factorization.

161012539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 161012539 is about 12689.0716366486. The cubic root of 161012539 is about 544.0263050915.

The spelling of 161012539 in words is "one hundred sixty-one million, twelve thousand, five hundred thirty-nine".