2157250097 has 4 divisors (see below), whose sum is σ = 2157702756. Its totient is φ = 2156797440.

The previous prime is 2157250093. The next prime is 2157250111. The reversal of 2157250097 is 7900527512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 142945936 + 2014304161 = 11956^2 + 44881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157250097 - 2² = 2157250093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157250097.

It is not an unprimeable number, because it can be changed into a prime (2157250091) 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, 219104 + ... + 228737.

It is an arithmetic number, because the mean of its divisors is an integer number (539425689).

Almost surely, 2^2157250097 is an apocalyptic number.

It is an amenable number.

2157250097 is a deficient number, since it is larger than the sum of its proper divisors (452659).

2157250097 is an equidigital number, since it uses as much as digits as its factorization.

2157250097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452658.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 2157250097 is about 46446.2064866443. The cubic root of 2157250097 is about 1292.1120175045.

The spelling of 2157250097 in words is "two billion, one hundred fifty-seven million, two hundred fifty thousand, ninety-seven".