97851797 has 2 divisors, whose sum is σ = 97851798. Its totient is φ = 97851796.

The previous prime is 97851781. The next prime is 97851799. The reversal of 97851797 is 79715879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87347716 + 10504081 = 9346^2 + 3241^2 .

It is an emirp because it is prime and its reverse (79715879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97851797 - 2⁴ = 97851781 is a prime.

It is a super-2 number, since 2×97851797² = 19149948352258418, which contains 22 as substring.

Together with 97851799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97851799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48925898 + 48925899.

It is an arithmetic number, because the mean of its divisors is an integer number (48925899).

Almost surely, 2^97851797 is an apocalyptic number.

97851797 is the 5288-th centered heptagonal number.

It is an amenable number.

97851797 is a deficient number, since it is larger than the sum of its proper divisors (1).

97851797 is an equidigital number, since it uses as much as digits as its factorization.

97851797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 53.

The square root of 97851797 is about 9892.0067226018. The cubic root of 97851797 is about 460.8111036223.

The spelling of 97851797 in words is "ninety-seven million, eight hundred fifty-one thousand, seven hundred ninety-seven".