2520191897 has 4 divisors (see below), whose sum is σ = 2520292560. Its totient is φ = 2520091236.

The previous prime is 2520191887. The next prime is 2520191899. The reversal of 2520191897 is 7981910252.

It is a happy number.

2520191897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2520191897 - 2¹⁰ = 2520190873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2520191899) 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, 19754 + ... + 73692.

It is an arithmetic number, because the mean of its divisors is an integer number (630073140).

Almost surely, 2^2520191897 is an apocalyptic number.

It is an amenable number.

2520191897 is a deficient number, since it is larger than the sum of its proper divisors (100663).

2520191897 is an equidigital number, since it uses as much as digits as its factorization.

2520191897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100662.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 2520191897 is about 50201.5128955294. The cubic root of 2520191897 is about 1360.8529642416.

The spelling of 2520191897 in words is "two billion, five hundred twenty million, one hundred ninety-one thousand, eight hundred ninety-seven".