16181953 has 2 divisors, whose sum is σ = 16181954. Its totient is φ = 16181952.

The previous prime is 16181951. The next prime is 16181981. The reversal of 16181953 is 35918161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15147664 + 1034289 = 3892^2 + 1017^2 .

It is a cyclic number.

It is not a de Polignac number, because 16181953 - 2¹ = 16181951 is a prime.

Together with 16181951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16181951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8090976 + 8090977.

It is an arithmetic number, because the mean of its divisors is an integer number (8090977).

Almost surely, 2^16181953 is an apocalyptic number.

It is an amenable number.

16181953 is a deficient number, since it is larger than the sum of its proper divisors (1).

16181953 is an equidigital number, since it uses as much as digits as its factorization.

16181953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The square root of 16181953 is about 4022.6798281742. The cubic root of 16181953 is about 252.9358052381.

The spelling of 16181953 in words is "sixteen million, one hundred eighty-one thousand, nine hundred fifty-three".