97161253849 has 27 divisors (see below), whose sum is σ = 109504660629. Its totient is φ = 86143346520.

The previous prime is 97161253823. The next prime is 97161253859. The reversal of 97161253849 is 94835216179.

It is a happy number.

The square root of 97161253849 is 311707.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-97161253849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97161253849.

It is not an unprimeable number, because it can be changed into a prime (97161253859) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 147437082 + ... + 147437740.

Almost surely, 2^97161253849 is an apocalyptic number.

97161253849 is the 311707-th square number.

97161253849 is the 155854-th centered octagonal number.

It is an amenable number.

97161253849 is a deficient number, since it is larger than the sum of its proper divisors (12343406780).

97161253849 is an frugal number, since it uses more digits than its factorization.

97161253849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 713 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The spelling of 97161253849 in words is "ninety-seven billion, one hundred sixty-one million, two hundred fifty-three thousand, eight hundred forty-nine".