1020161 has 4 divisors (see below), whose sum is σ = 1023792. Its totient is φ = 1016532.

The previous prime is 1020157. The next prime is 1020163. The reversal of 1020161 is 1610201.

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: 1610201 = 277 ⋅5813.

It is a cyclic number.

It is not a de Polignac number, because 1020161 - 2² = 1020157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (255948).

2^1020161 is an apocalyptic number.

It is an amenable number.

1020161 is a deficient number, since it is larger than the sum of its proper divisors (3631).

1020161 is an equidigital number, since it uses as much as digits as its factorization.

1020161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1020161 is about 1010.0301975684. The cubic root of 1020161 is about 100.6675669603.

Adding to 1020161 its reverse (1610201), we get a palindrome (2630362).

The spelling of 1020161 in words is "one million, twenty thousand, one hundred sixty-one".