1020155161 has 4 divisors (see below), whose sum is σ = 1053063424. Its totient is φ = 987246900.

The previous prime is 1020155117. The next prime is 1020155209. The reversal of 1020155161 is 1615510201.

It is a happy number.

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: 1615510201 = 36809 ⋅43889.

It is a cyclic number.

It is not a de Polignac number, because 1020155161 - 2¹³ = 1020146969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020155861) 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, 16454085 + ... + 16454146.

It is an arithmetic number, because the mean of its divisors is an integer number (263265856).

Almost surely, 2^1020155161 is an apocalyptic number.

It is an amenable number.

1020155161 is a deficient number, since it is larger than the sum of its proper divisors (32908263).

1020155161 is an equidigital number, since it uses as much as digits as its factorization.

1020155161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32908262.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1020155161 is about 31939.8678926510. The cubic root of 1020155161 is about 1006.6737489938.

Adding to 1020155161 its reverse (1615510201), we get a palindrome (2635665362).

The spelling of 1020155161 in words is "one billion, twenty million, one hundred fifty-five thousand, one hundred sixty-one".