1097211531988 has 96 divisors (see below), whose sum is σ = 2276564209920. Its totient is φ = 456148592640.

The previous prime is 1097211531967. The next prime is 1097211531989. The reversal of 1097211531988 is 8891351127901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097211531989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32222620 + ... + 32256652.

It is an arithmetic number, because the mean of its divisors is an integer number (23714210520).

Almost surely, 2^{1097211531988} is an apocalyptic number.

It is an amenable number.

1097211531988 is an abundant number, since it is smaller than the sum of its proper divisors (1179352677932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1097211531988 is a wasteful number, since it uses less digits than its factorization.

1097211531988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34577 (or 34575 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 55.

The spelling of 1097211531988 in words is "one trillion, ninety-seven billion, two hundred eleven million, five hundred thirty-one thousand, nine hundred eighty-eight".