997001351531 has 4 divisors (see below), whose sum is σ = 997414875864. Its totient is φ = 996587827200.

The previous prime is 997001351519. The next prime is 997001351569. The reversal of 997001351531 is 135153100799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 997001351531 - 2¹⁰ = 997001350507 is a prime.

It is a super-2 number, since 2×997001351531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997001351431) 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 3 ways as a sum of consecutive naturals, for example, 206758550 + ... + 206763371.

It is an arithmetic number, because the mean of its divisors is an integer number (249353718966).

Almost surely, 2^997001351531 is an apocalyptic number.

997001351531 is a deficient number, since it is larger than the sum of its proper divisors (413524333).

997001351531 is a wasteful number, since it uses less digits than its factorization.

997001351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413524332.

The product of its (nonzero) digits is 127575, while the sum is 44.

The spelling of 997001351531 in words is "nine hundred ninety-seven billion, one million, three hundred fifty-one thousand, five hundred thirty-one".