1897949563 has 4 divisors (see below), whose sum is σ = 1898868960. Its totient is φ = 1897030168.

The previous prime is 1897949461. The next prime is 1897949567. The reversal of 1897949563 is 3659497981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3659497981 = 12613 ⋅290137.

It is a cyclic number.

It is not a de Polignac number, because 1897949563 - 2²¹ = 1895852411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897949567) 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, 456595 + ... + 460732.

It is an arithmetic number, because the mean of its divisors is an integer number (474717240).

Almost surely, 2^1897949563 is an apocalyptic number.

1897949563 is a deficient number, since it is larger than the sum of its proper divisors (919397).

1897949563 is an equidigital number, since it uses as much as digits as its factorization.

1897949563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919396.

The product of its digits is 14696640, while the sum is 61.

The square root of 1897949563 is about 43565.4629609281. The cubic root of 1897949563 is about 1238.1166264489.

The spelling of 1897949563 in words is "one billion, eight hundred ninety-seven million, nine hundred forty-nine thousand, five hundred sixty-three".