97661953 has 2 divisors, whose sum is σ = 97661954. Its totient is φ = 97661952.

The previous prime is 97661917. The next prime is 97661999. The reversal of 97661953 is 35916679.

It is an a-pointer prime, because the next prime (97661999) can be obtained adding 97661953 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90307009 + 7354944 = 9503^2 + 2712^2 .

It is an emirp because it is prime and its reverse (35916679) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97661953 is a prime.

It is not a weakly prime, because it can be changed into another prime (97661353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48830976 + 48830977.

It is an arithmetic number, because the mean of its divisors is an integer number (48830977).

Almost surely, 2^97661953 is an apocalyptic number.

It is an amenable number.

97661953 is a deficient number, since it is larger than the sum of its proper divisors (1).

97661953 is an equidigital number, since it uses as much as digits as its factorization.

97661953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 46.

The square root of 97661953 is about 9882.4062353255. The cubic root of 97661953 is about 460.5129014357.

The spelling of 97661953 in words is "ninety-seven million, six hundred sixty-one thousand, nine hundred fifty-three".