1897197090531 has 8 divisors (see below), whose sum is σ = 2662732758720. Its totient is φ = 1198229741352.

The previous prime is 1897197090527. The next prime is 1897197090533. The reversal of 1897197090531 is 1350907917981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1897197090531 - 2² = 1897197090527 is a prime.

It is a super-2 number, since 2×1897197090531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897197090533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16642079685 + ... + 16642079798.

It is an arithmetic number, because the mean of its divisors is an integer number (332841594840).

Almost surely, 2^{1897197090531} is an apocalyptic number.

1897197090531 is a deficient number, since it is larger than the sum of its proper divisors (765535668189).

1897197090531 is a wasteful number, since it uses less digits than its factorization.

1897197090531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33284159505.

The product of its (nonzero) digits is 4286520, while the sum is 60.

The spelling of 1897197090531 in words is "one trillion, eight hundred ninety-seven billion, one hundred ninety-seven million, ninety thousand, five hundred thirty-one".