161711025 has 72 divisors (see below), whose sum is σ = 315515520. Its totient is φ = 72858240.

The previous prime is 161710993. The next prime is 161711057. The reversal of 161711025 is 520117161.

It is an interprime number because it is at equal distance from previous prime (161710993) and next prime (161711057).

It is not a de Polignac number, because 161711025 - 2⁵ = 161710993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161710986 and 161711004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 290047 + ... + 290603.

It is an arithmetic number, because the mean of its divisors is an integer number (4382160).

Almost surely, 2^161711025 is an apocalyptic number.

161711025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161711025 is a deficient number, since it is larger than the sum of its proper divisors (153804495).

161711025 is a wasteful number, since it uses less digits than its factorization.

161711025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 161711025 is about 12716.5649843030. The cubic root of 161711025 is about 544.8118476284.

Adding to 161711025 its reverse (520117161), we get a palindrome (681828186).

The spelling of 161711025 in words is "one hundred sixty-one million, seven hundred eleven thousand, twenty-five".