1591151200109 has 4 divisors (see below), whose sum is σ = 1591296217116. Its totient is φ = 1591006183104.

The previous prime is 1591151200099. The next prime is 1591151200117. The reversal of 1591151200109 is 9010021511951.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1271414104900 + 319737095209 = 1127570^2 + 565453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591151200109 - 2¹² = 1591151196013 is a prime.

It is a super-2 number, since 2×1591151200109² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591151205109) 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, 72492044 + ... + 72513989.

It is an arithmetic number, because the mean of its divisors is an integer number (397824054279).

Almost surely, 2^{1591151200109} is an apocalyptic number.

It is an amenable number.

1591151200109 is a deficient number, since it is larger than the sum of its proper divisors (145017007).

1591151200109 is a wasteful number, since it uses less digits than its factorization.

1591151200109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145017006.

The product of its (nonzero) digits is 4050, while the sum is 35.

The spelling of 1591151200109 in words is "one trillion, five hundred ninety-one billion, one hundred fifty-one million, two hundred thousand, one hundred nine".