1891516497 has 16 divisors (see below), whose sum is σ = 2720182080. Its totient is φ = 1162228032.

The previous prime is 1891516489. The next prime is 1891516531. The reversal of 1891516497 is 7946151981.

It is not a de Polignac number, because 1891516497 - 2³ = 1891516489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1891516447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11098 + ... + 62499.

It is an arithmetic number, because the mean of its divisors is an integer number (170011380).

Almost surely, 2^1891516497 is an apocalyptic number.

It is an amenable number.

1891516497 is a deficient number, since it is larger than the sum of its proper divisors (828665583).

1891516497 is a wasteful number, since it uses less digits than its factorization.

1891516497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74272.

The product of its digits is 544320, while the sum is 51.

The square root of 1891516497 is about 43491.5681138310. The cubic root of 1891516497 is about 1236.7161849657.

The spelling of 1891516497 in words is "one billion, eight hundred ninety-one million, five hundred sixteen thousand, four hundred ninety-seven".