1245668889 has 4 divisors (see below), whose sum is σ = 1660891856. Its totient is φ = 830445924.

The previous prime is 1245668887. The next prime is 1245668909. The reversal of 1245668889 is 9888665421.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9888665421 = 3 ⋅3296221807.

It is not a de Polignac number, because 1245668889 - 2¹ = 1245668887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1245668881) 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, 207611479 + ... + 207611484.

It is an arithmetic number, because the mean of its divisors is an integer number (415222964).

Almost surely, 2^1245668889 is an apocalyptic number.

It is an amenable number.

1245668889 is a deficient number, since it is larger than the sum of its proper divisors (415222967).

1245668889 is an equidigital number, since it uses as much as digits as its factorization.

1245668889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415222966.

The product of its digits is 6635520, while the sum is 57.

The square root of 1245668889 is about 35294.0347509321. The cubic root of 1245668889 is about 1075.9717591962.

The spelling of 1245668889 in words is "one billion, two hundred forty-five million, six hundred sixty-eight thousand, eight hundred eighty-nine".