1229809057 has 4 divisors (see below), whose sum is σ = 1283279040. Its totient is φ = 1176339076.

The previous prime is 1229809051. The next prime is 1229809099. The reversal of 1229809057 is 7509089221.

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 1229809057 - 2⁷ = 1229808929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1229809051) 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, 26734957 + ... + 26735002.

It is an arithmetic number, because the mean of its divisors is an integer number (320819760).

Almost surely, 2^1229809057 is an apocalyptic number.

It is an amenable number.

1229809057 is a deficient number, since it is larger than the sum of its proper divisors (53469983).

1229809057 is an equidigital number, since it uses as much as digits as its factorization.

1229809057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53469982.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 1229809057 is about 35068.6335205693. The cubic root of 1229809057 is about 1071.3858239461.

The spelling of 1229809057 in words is "one billion, two hundred twenty-nine million, eight hundred nine thousand, fifty-seven".