1896557497 has 4 divisors (see below), whose sum is σ = 1915335396. Its totient is φ = 1877779600.

The previous prime is 1896557491. The next prime is 1896557501. The reversal of 1896557497 is 7947556981.

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 1463751081 + 432806416 = 38259^2 + 20804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1896557497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1896557491) 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, 9388798 + ... + 9388999.

It is an arithmetic number, because the mean of its divisors is an integer number (478833849).

Almost surely, 2^1896557497 is an apocalyptic number.

It is an amenable number.

1896557497 is a deficient number, since it is larger than the sum of its proper divisors (18777899).

1896557497 is a wasteful number, since it uses less digits than its factorization.

1896557497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18777898.

The product of its digits is 19051200, while the sum is 61.

The square root of 1896557497 is about 43549.4833149602. The cubic root of 1896557497 is about 1237.8138502940.

The spelling of 1896557497 in words is "one billion, eight hundred ninety-six million, five hundred fifty-seven thousand, four hundred ninety-seven".