1249864667 has 4 divisors (see below), whose sum is σ = 1323386136. Its totient is φ = 1176343200.

The previous prime is 1249864661. The next prime is 1249864723. The reversal of 1249864667 is 7664689421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1249864667 - 2¹² = 1249860571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249864661) 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, 36760709 + ... + 36760742.

It is an arithmetic number, because the mean of its divisors is an integer number (330846534).

Almost surely, 2^1249864667 is an apocalyptic number.

1249864667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1249864667 is a deficient number, since it is larger than the sum of its proper divisors (73521469).

1249864667 is an equidigital number, since it uses as much as digits as its factorization.

1249864667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73521468.

The product of its digits is 3483648, while the sum is 53.

The square root of 1249864667 is about 35353.4251098815. The cubic root of 1249864667 is about 1077.1784681316.

The spelling of 1249864667 in words is "one billion, two hundred forty-nine million, eight hundred sixty-four thousand, six hundred sixty-seven".