165081401 has 2 divisors, whose sum is σ = 165081402. Its totient is φ = 165081400.

The previous prime is 165081377. The next prime is 165081451. The reversal of 165081401 is 104180561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154355776 + 10725625 = 12424^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 165081401 - 2¹⁸ = 164819257 is a prime.

It is a super-2 number, since 2×165081401² = 54503737912245602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165081451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82540700 + 82540701.

It is an arithmetic number, because the mean of its divisors is an integer number (82540701).

Almost surely, 2^165081401 is an apocalyptic number.

It is an amenable number.

165081401 is a deficient number, since it is larger than the sum of its proper divisors (1).

165081401 is an equidigital number, since it uses as much as digits as its factorization.

165081401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 165081401 is about 12848.4007175991. The cubic root of 165081401 is about 548.5708361196.

The spelling of 165081401 in words is "one hundred sixty-five million, eighty-one thousand, four hundred one".