161532461 has 4 divisors (see below), whose sum is σ = 161918400. Its totient is φ = 161146524.

The previous prime is 161532439. The next prime is 161532463. The reversal of 161532461 is 164235161.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164235161 = 1097 ⋅149713.

It is a cyclic number.

It is not a de Polignac number, because 161532461 - 2¹⁰ = 161531437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161532463) 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, 192341 + ... + 193178.

It is an arithmetic number, because the mean of its divisors is an integer number (40479600).

Almost surely, 2^161532461 is an apocalyptic number.

It is an amenable number.

161532461 is a deficient number, since it is larger than the sum of its proper divisors (385939).

161532461 is an equidigital number, since it uses as much as digits as its factorization.

161532461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385938.

The product of its digits is 4320, while the sum is 29.

The square root of 161532461 is about 12709.5421239319. The cubic root of 161532461 is about 544.6112436762.

The spelling of 161532461 in words is "one hundred sixty-one million, five hundred thirty-two thousand, four hundred sixty-one".