1301639249 has 4 divisors (see below), whose sum is σ = 1309433664. Its totient is φ = 1293844836.

The previous prime is 1301639239. The next prime is 1301639257. The reversal of 1301639249 is 9429361031.

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: 9429361031 = 1213 ⋅7773587.

It is a cyclic number.

It is not a de Polignac number, because 1301639249 - 2⁴ = 1301639233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1301639239) 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, 3896957 + ... + 3897290.

It is an arithmetic number, because the mean of its divisors is an integer number (327358416).

Almost surely, 2^1301639249 is an apocalyptic number.

It is an amenable number.

1301639249 is a deficient number, since it is larger than the sum of its proper divisors (7794415).

1301639249 is an equidigital number, since it uses as much as digits as its factorization.

1301639249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7794414.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 1301639249 is about 36078.2378865709. The cubic root of 1301639249 is about 1091.8514249171.

The spelling of 1301639249 in words is "one billion, three hundred one million, six hundred thirty-nine thousand, two hundred forty-nine".