1012161605 has 32 divisors (see below), whose sum is σ = 1497533184.
Its totient is φ = 639530496.
The previous prime is 1012161551. The next prime is 1012161637. The reversal of 1012161605 is 5061612101.
It is a cyclic number.
It is not a de Polignac number, because 1012161605 - 218 = 1011899461 is a prime.
It is a super-2 number, since 2×10121616052 = 2048942229272352050, which contains 22 as substring.
It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309137 + ... + 312393.
It is an arithmetic number, because the mean of its divisors is an integer number (46797912).
Almost surely, 21012161605 is an apocalyptic number.
It is an amenable number.
1012161605 is a deficient number, since it is larger than the sum of its proper divisors (485371579).
1012161605 is a wasteful number, since it uses less digits than its factorization.
1012161605 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3965.
The product of its (nonzero) digits is 360, while the sum is 23.
The square root of 1012161605 is about 31814.4873446045.
The cubic root of 1012161605 is about 1004.0375446270.
Adding to 1012161605 its reverse (5061612101), we get a palindrome (6073773706).
The spelling of 1012161605 in words is "one billion, twelve million, one hundred sixty-one thousand, six hundred five".