1971814149369 has 9 divisors (see below), whose sum is σ = 2848182078469. Its totient is φ = 1314539957820.

The previous prime is 1971814149313. The next prime is 1971814149413. The reversal of 1971814149369 is 9639414181791.

The square root of 1971814149369 is 1404213.

It is a perfect power (a square), and thus also a powerful number.

1971814149369 is a `hidden beast` number, since 1 + 9 + 7 + 1 + 81 + 4 + 1 + 493 + 69 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1971814149369 - 2¹¹ = 1971814147321 is a prime.

It is a super-2 number, since 2×1971814149369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971814149169) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3978604 + ... + 4446674.

Almost surely, 2^{1971814149369} is an apocalyptic number.

1971814149369 is the 1404213-rd square number.

1971814149369 is the 702107-th centered octagonal number.

It is an amenable number.

1971814149369 is a deficient number, since it is larger than the sum of its proper divisors (876367929100).

1971814149369 is an frugal number, since it uses more digits than its factorization.

1971814149369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936148 (or 468074 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The spelling of 1971814149369 in words is "one trillion, nine hundred seventy-one billion, eight hundred fourteen million, one hundred forty-nine thousand, three hundred sixty-nine".