161253529 has 4 divisors (see below), whose sum is σ = 168264576. Its totient is φ = 154242484.

The previous prime is 161253527. The next prime is 161253541. The reversal of 161253529 is 925352161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161253529 - 2¹ = 161253527 is a prime.

It is a super-2 number, since 2×161253529² = 52005401229907682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161253494 and 161253503.

It is not an unprimeable number, because it can be changed into a prime (161253527) 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, 3505489 + ... + 3505534.

It is an arithmetic number, because the mean of its divisors is an integer number (42066144).

Almost surely, 2^161253529 is an apocalyptic number.

It is an amenable number.

161253529 is a deficient number, since it is larger than the sum of its proper divisors (7011047).

161253529 is an equidigital number, since it uses as much as digits as its factorization.

161253529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011046.

The product of its digits is 16200, while the sum is 34.

The square root of 161253529 is about 12698.5640526793. The cubic root of 161253529 is about 544.2975873687.

The spelling of 161253529 in words is "one hundred sixty-one million, two hundred fifty-three thousand, five hundred twenty-nine".