151271989969 has 3 divisors (see below), whose sum is σ = 151272378907. Its totient is φ = 151271601032.

The previous prime is 151271989963. The next prime is 151271990041. The reversal of 151271989969 is 969989172151.

The square root of 151271989969 is 388937.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 969989172151 = 21347 ⋅45439133.

It can be written as a sum of positive squares in only one way, i.e., 142419438225 + 8852551744 = 377385^2 + 94088^2 .

It is not a de Polignac number, because 151271989969 - 2³ = 151271989961 is a prime.

It is a super-2 number, since 2×151271989969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151271989961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 194469 + ... + 583405.

Almost surely, 2^151271989969 is an apocalyptic number.

151271989969 is the 388937-th square number.

151271989969 is the 194469-th centered octagonal number.

It is an amenable number.

151271989969 is a deficient number, since it is larger than the sum of its proper divisors (388938).

151271989969 is an frugal number, since it uses more digits than its factorization.

151271989969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777874 (or 388937 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 67.

The spelling of 151271989969 in words is "one hundred fifty-one billion, two hundred seventy-one million, nine hundred eighty-nine thousand, nine hundred sixty-nine".