1971602145 has 24 divisors (see below), whose sum is σ = 3418535016. Its totient is φ = 1051185408.

The previous prime is 1971602141. The next prime is 1971602221. The reversal of 1971602145 is 5412061791.

1971602145 is a `hidden beast` number, since 1 + 9 + 7 + 1 + 602 + 1 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28643904 + 1942958241 = 5352^2 + 44079^2 .

It is not a de Polignac number, because 1971602145 - 2² = 1971602141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971602141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208357 + ... + 217613.

It is an arithmetic number, because the mean of its divisors is an integer number (142438959).

Almost surely, 2^1971602145 is an apocalyptic number.

1971602145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1971602145 is a deficient number, since it is larger than the sum of its proper divisors (1446932871).

1971602145 is a wasteful number, since it uses less digits than its factorization.

1971602145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14001 (or 13998 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1971602145 is about 44402.7267743773. The cubic root of 1971602145 is about 1253.9294256811.

The spelling of 1971602145 in words is "one billion, nine hundred seventy-one million, six hundred two thousand, one hundred forty-five".