97215785969 has 4 divisors (see below), whose sum is σ = 101442559296. Its totient is φ = 92989012644.

The previous prime is 97215785963. The next prime is 97215786001. The reversal of 97215785969 is 96958751279.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97215785969 is a prime.

It is a super-2 number, since 2×97215785969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97215785899 and 97215785908.

It is not an unprimeable number, because it can be changed into a prime (97215785963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113386629 + ... + 2113386674.

It is an arithmetic number, because the mean of its divisors is an integer number (25360639824).

Almost surely, 2^97215785969 is an apocalyptic number.

It is an amenable number.

97215785969 is a deficient number, since it is larger than the sum of its proper divisors (4226773327).

97215785969 is a wasteful number, since it uses less digits than its factorization.

97215785969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226773326.

The product of its digits is 85730400, while the sum is 68.

The spelling of 97215785969 in words is "ninety-seven billion, two hundred fifteen million, seven hundred eighty-five thousand, nine hundred sixty-nine".