97790287081 has 4 divisors (see below), whose sum is σ = 97999688592. Its totient is φ = 97580885572.

The previous prime is 97790287079. The next prime is 97790287139. The reversal of 97790287081 is 18078209779.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18078209779 = 7 ⋅2582601397.

It is a cyclic number.

It is not a de Polignac number, because 97790287081 - 2¹ = 97790287079 is a prime.

It is a super-2 number, since 2×97790287081² (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 (97790287031) 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, 104700055 + ... + 104700988.

It is an arithmetic number, because the mean of its divisors is an integer number (24499922148).

Almost surely, 2^97790287081 is an apocalyptic number.

It is an amenable number.

97790287081 is a deficient number, since it is larger than the sum of its proper divisors (209401511).

97790287081 is a wasteful number, since it uses less digits than its factorization.

97790287081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209401510.

The product of its (nonzero) digits is 3556224, while the sum is 58.

The spelling of 97790287081 in words is "ninety-seven billion, seven hundred ninety million, two hundred eighty-seven thousand, eighty-one".