1172642989 has 4 divisors (see below), whose sum is σ = 1340163424. Its totient is φ = 1005122556.

The previous prime is 1172642987. The next prime is 1172642993. The reversal of 1172642989 is 9892462711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1172642989 - 2¹ = 1172642987 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 (1172642987) 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, 83760207 + ... + 83760220.

It is an arithmetic number, because the mean of its divisors is an integer number (335040856).

Almost surely, 2^1172642989 is an apocalyptic number.

It is an amenable number.

1172642989 is a deficient number, since it is larger than the sum of its proper divisors (167520435).

1172642989 is an equidigital number, since it uses as much as digits as its factorization.

1172642989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167520434.

The product of its digits is 435456, while the sum is 49.

The square root of 1172642989 is about 34243.8752041880. The cubic root of 1172642989 is about 1054.5210913819.

The spelling of 1172642989 in words is "one billion, one hundred seventy-two million, six hundred forty-two thousand, nine hundred eighty-nine".