19970531 has 8 divisors (see below), whose sum is σ = 23610720. Its totient is φ = 16527168.

The previous prime is 19970527. The next prime is 19970543. The reversal of 19970531 is 13507991.

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

It is not a de Polignac number, because 19970531 - 2² = 19970527 is a prime.

It is a super-2 number, since 2×19970531² = 797644216843922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19970491 and 19970500.

It is not an unprimeable number, because it can be changed into a prime (19970521) 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 7 ways as a sum of consecutive naturals, for example, 48986 + ... + 49391.

It is an arithmetic number, because the mean of its divisors is an integer number (2951340).

Almost surely, 2^19970531 is an apocalyptic number.

19970531 is a deficient number, since it is larger than the sum of its proper divisors (3640189).

19970531 is an equidigital number, since it uses as much as digits as its factorization.

19970531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98413.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 19970531 is about 4468.8400060866. The cubic root of 19970531 is about 271.3083775052.

The spelling of 19970531 in words is "nineteen million, nine hundred seventy thousand, five hundred thirty-one".