161762461 has 4 divisors (see below), whose sum is σ = 184871392. Its totient is φ = 138653532.

The previous prime is 161762459. The next prime is 161762521. The reversal of 161762461 is 164267161.

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: 164267161 = 37 ⋅4439653.

It is a cyclic number.

It is not a de Polignac number, because 161762461 - 2¹ = 161762459 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 (161762411) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11554455 + ... + 11554468.

It is an arithmetic number, because the mean of its divisors is an integer number (46217848).

Almost surely, 2^161762461 is an apocalyptic number.

It is an amenable number.

161762461 is a deficient number, since it is larger than the sum of its proper divisors (23108931).

161762461 is an equidigital number, since it uses as much as digits as its factorization.

161762461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23108930.

The product of its digits is 12096, while the sum is 34.

The square root of 161762461 is about 12718.5872250026. The cubic root of 161762461 is about 544.8696049182.

The spelling of 161762461 in words is "one hundred sixty-one million, seven hundred sixty-two thousand, four hundred sixty-one".