1197657139 has 4 divisors (see below), whose sum is σ = 1368751024. Its totient is φ = 1026563256.

The previous prime is 1197657137. The next prime is 1197657161. The reversal of 1197657139 is 9317567911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9317567911 = 59629 ⋅156259.

It is a cyclic number.

It is not a de Polignac number, because 1197657139 - 2¹ = 1197657137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1197657092 and 1197657101.

It is not an unprimeable number, because it can be changed into a prime (1197657137) 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, 85546932 + ... + 85546945.

It is an arithmetic number, because the mean of its divisors is an integer number (342187756).

Almost surely, 2^1197657139 is an apocalyptic number.

1197657139 is a deficient number, since it is larger than the sum of its proper divisors (171093885).

1197657139 is an equidigital number, since it uses as much as digits as its factorization.

1197657139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171093884.

The product of its digits is 357210, while the sum is 49.

The square root of 1197657139 is about 34607.1833439244. The cubic root of 1197657139 is about 1061.9665460337.

The spelling of 1197657139 in words is "one billion, one hundred ninety-seven million, six hundred fifty-seven thousand, one hundred thirty-nine".