1491101097165 has 24 divisors (see below), whose sum is σ = 2736609073848. Its totient is φ = 748474275840.

The previous prime is 1491101097151. The next prime is 1491101097193. The reversal of 1491101097165 is 5617901011941.

It is a happy number.

1491101097165 is a `hidden beast` number, since 1 + 491 + 1 + 0 + 10 + 97 + 1 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 472901031684 + 1018200065481 = 687678^2 + 1009059^2 .

It is not a de Polignac number, because 1491101097165 - 2⁴ = 1491101097149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1491101097165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 974575116 + ... + 974576645.

It is an arithmetic number, because the mean of its divisors is an integer number (114025378077).

Almost surely, 2^{1491101097165} is an apocalyptic number.

1491101097165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1491101097165 is a deficient number, since it is larger than the sum of its proper divisors (1245507976683).

1491101097165 is a wasteful number, since it uses less digits than its factorization.

1491101097165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949151789 (or 1949151786 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 45.

The spelling of 1491101097165 in words is "one trillion, four hundred ninety-one billion, one hundred one million, ninety-seven thousand, one hundred sixty-five".