1171957698 has 18 divisors (see below), whose sum is σ = 2539556409. Its totient is φ = 390604152.

The previous prime is 1171957693. The next prime is 1171957711. The reversal of 1171957698 is 8967591711.

It can be written as a sum of positive squares in 2 ways, for example, as 641254329 + 530703369 = 25323^2 + 23037^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24207.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1171957693) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 141208 + ... + 149276.

Almost surely, 2^1171957698 is an apocalyptic number.

1171957698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1171957698 is an abundant number, since it is smaller than the sum of its proper divisors (1367598711).

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

1171957698 is an frugal number, since it uses more digits than its factorization.

1171957698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16146 (or 8074 counting only the distinct ones).

The product of its digits is 952560, while the sum is 54.

The square root of 1171957698 is about 34233.8677043655. The cubic root of 1171957698 is about 1054.3156311130.

The spelling of 1171957698 in words is "one billion, one hundred seventy-one million, nine hundred fifty-seven thousand, six hundred ninety-eight".