97309211638 has 4 divisors (see below), whose sum is σ = 145963817460. Its totient is φ = 48654605818.

The previous prime is 97309211609. The next prime is 97309211651. The reversal of 97309211638 is 83611290379.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 97309211591 and 97309211600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24327302908 + ... + 24327302911.

It is an arithmetic number, because the mean of its divisors is an integer number (36490954365).

Almost surely, 2^97309211638 is an apocalyptic number.

97309211638 is a deficient number, since it is larger than the sum of its proper divisors (48654605822).

97309211638 is a wasteful number, since it uses less digits than its factorization.

97309211638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48654605821.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 97309211638 in words is "ninety-seven billion, three hundred nine million, two hundred eleven thousand, six hundred thirty-eight".