181746401 has 2 divisors, whose sum is σ = 181746402. Its totient is φ = 181746400.

The previous prime is 181746377. The next prime is 181746403. The reversal of 181746401 is 104647181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 67256401 = 10700^2 + 8201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181746401 is a prime.

Together with 181746403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181746403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90873200 + 90873201.

It is an arithmetic number, because the mean of its divisors is an integer number (90873201).

Almost surely, 2^181746401 is an apocalyptic number.

It is an amenable number.

181746401 is a deficient number, since it is larger than the sum of its proper divisors (1).

181746401 is an equidigital number, since it uses as much as digits as its factorization.

181746401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 181746401 is about 13481.3352825304. The cubic root of 181746401 is about 566.4417726185.

The spelling of 181746401 in words is "one hundred eighty-one million, seven hundred forty-six thousand, four hundred one".