181650901 has 2 divisors, whose sum is σ = 181650902. Its totient is φ = 181650900.

The previous prime is 181650857. The next prime is 181650907. The reversal of 181650901 is 109056181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96550276 + 85100625 = 9826^2 + 9225^2 .

It is a cyclic number.

It is not a de Polignac number, because 181650901 - 2¹¹ = 181648853 is a prime.

It is a super-2 number, since 2×181650901² = 65994099668223602, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181650907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90825450 + 90825451.

It is an arithmetic number, because the mean of its divisors is an integer number (90825451).

Almost surely, 2^181650901 is an apocalyptic number.

It is an amenable number.

181650901 is a deficient number, since it is larger than the sum of its proper divisors (1).

181650901 is an equidigital number, since it uses as much as digits as its factorization.

181650901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 181650901 is about 13477.7928831096. The cubic root of 181650901 is about 566.3425415532.

The spelling of 181650901 in words is "one hundred eighty-one million, six hundred fifty thousand, nine hundred one".