1997235451351 has 16 divisors (see below), whose sum is σ = 2352588068160. Its totient is φ = 1659720464640.

The previous prime is 1997235451319. The next prime is 1997235451363. The reversal of 1997235451351 is 1531545327991.

It is not a de Polignac number, because 1997235451351 - 2⁵ = 1997235451319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997235451292 and 1997235451301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997235451051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13648456 + ... + 13794013.

It is an arithmetic number, because the mean of its divisors is an integer number (147036754260).

Almost surely, 2^{1997235451351} is an apocalyptic number.

1997235451351 is a deficient number, since it is larger than the sum of its proper divisors (355352616809).

1997235451351 is a wasteful number, since it uses less digits than its factorization.

1997235451351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27442794.

The product of its digits is 5103000, while the sum is 55.

The spelling of 1997235451351 in words is "one trillion, nine hundred ninety-seven billion, two hundred thirty-five million, four hundred fifty-one thousand, three hundred fifty-one".