97140557821 has 8 divisors (see below), whose sum is σ = 98777778264. Its totient is φ = 95504781120.

The previous prime is 97140557791. The next prime is 97140557831. The reversal of 97140557821 is 12875504179.

It can be written as a sum of positive squares in 4 ways, for example, as 4011828921 + 93128728900 = 63339^2 + 305170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97140557821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97140557831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224806 + ... + 494791.

It is an arithmetic number, because the mean of its divisors is an integer number (12347222283).

Almost surely, 2^97140557821 is an apocalyptic number.

It is an amenable number.

97140557821 is a deficient number, since it is larger than the sum of its proper divisors (1637220443).

97140557821 is a wasteful number, since it uses less digits than its factorization.

97140557821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721871.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 97140557821 in words is "ninety-seven billion, one hundred forty million, five hundred fifty-seven thousand, eight hundred twenty-one".