2145522197 has 16 divisors (see below), whose sum is σ = 2685406080. Its totient is φ = 1668779712.

The previous prime is 2145522193. The next prime is 2145522221. The reversal of 2145522197 is 7912255412.

It is a cyclic number.

It is not a de Polignac number, because 2145522197 - 2² = 2145522193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2145522197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145522193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194438 + ... + 205175.

It is an arithmetic number, because the mean of its divisors is an integer number (167837880).

Almost surely, 2^2145522197 is an apocalyptic number.

It is an amenable number.

2145522197 is a deficient number, since it is larger than the sum of its proper divisors (539883883).

2145522197 is a wasteful number, since it uses less digits than its factorization.

2145522197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399692.

The product of its digits is 50400, while the sum is 38.

The square root of 2145522197 is about 46319.7819187440. The cubic root of 2145522197 is about 1289.7662371124.

The spelling of 2145522197 in words is "two billion, one hundred forty-five million, five hundred twenty-two thousand, one hundred ninety-seven".