2157161107 has 4 divisors (see below), whose sum is σ = 2159072920. Its totient is φ = 2155249296.

The previous prime is 2157161089. The next prime is 2157161113. The reversal of 2157161107 is 7011617512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2157161107 - 2¹⁵ = 2157128339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157161407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954213 + ... + 956470.

It is an arithmetic number, because the mean of its divisors is an integer number (539768230).

Almost surely, 2^2157161107 is an apocalyptic number.

2157161107 is a deficient number, since it is larger than the sum of its proper divisors (1911813).

2157161107 is a wasteful number, since it uses less digits than its factorization.

2157161107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911812.

The product of its (nonzero) digits is 2940, while the sum is 31.

The square root of 2157161107 is about 46445.2484867936. The cubic root of 2157161107 is about 1292.0942500344.

Adding to 2157161107 its reverse (7011617512), we get a palindrome (9168778619).

The spelling of 2157161107 in words is "two billion, one hundred fifty-seven million, one hundred sixty-one thousand, one hundred seven".