1005139901 has 8 divisors (see below), whose sum is σ = 1011159864. Its totient is φ = 999129600.

The previous prime is 1005139867. The next prime is 1005139937. The reversal of 1005139901 is 1099315001.

It can be written as a sum of positive squares in 4 ways, for example, as 191407225 + 813732676 = 13835^2 + 28526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005139901 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 (1005139991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353381 + ... + 356213.

It is an arithmetic number, because the mean of its divisors is an integer number (126394983).

Almost surely, 2^1005139901 is an apocalyptic number.

It is an amenable number.

1005139901 is a deficient number, since it is larger than the sum of its proper divisors (6019963).

1005139901 is a wasteful number, since it uses less digits than its factorization.

1005139901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 1005139901 is about 31703.9414111243. The cubic root of 1005139901 is about 1001.7103732887.

The spelling of 1005139901 in words is "one billion, five million, one hundred thirty-nine thousand, nine hundred one".