97908455081 has 4 divisors (see below), whose sum is σ = 98532075972. Its totient is φ = 97284834192.

The previous prime is 97908455069. The next prime is 97908455083. The reversal of 97908455081 is 18055480979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18055480979 = 71 ⋅254302549.

It can be written as a sum of positive squares in 2 ways, for example, as 37755987481 + 60152467600 = 194309^2 + 245260^2 .

It is a cyclic number.

It is not a de Polignac number, because 97908455081 - 2²² = 97904260777 is a prime.

It is a super-2 number, since 2×97908455081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97908455083) 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, 311810210 + ... + 311810523.

It is an arithmetic number, because the mean of its divisors is an integer number (24633018993).

Almost surely, 2^97908455081 is an apocalyptic number.

It is an amenable number.

97908455081 is a deficient number, since it is larger than the sum of its proper divisors (623620891).

97908455081 is a wasteful number, since it uses less digits than its factorization.

97908455081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623620890.

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 97908455081 in words is "ninety-seven billion, nine hundred eight million, four hundred fifty-five thousand, eighty-one".