1641320145 has 16 divisors (see below), whose sum is σ = 2917902720. Its totient is φ = 875370672.

The previous prime is 1641320129. The next prime is 1641320171. The reversal of 1641320145 is 5410231461.

It is a happy number.

1641320145 is a `hidden beast` number, since 1 + 6 + 413 + 201 + 45 = 666.

It is not a de Polignac number, because 1641320145 - 2⁴ = 1641320129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6078829 + ... + 6079098.

It is an arithmetic number, because the mean of its divisors is an integer number (182368920).

Almost surely, 2^1641320145 is an apocalyptic number.

1641320145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641320145 is a deficient number, since it is larger than the sum of its proper divisors (1276582575).

1641320145 is a wasteful number, since it uses less digits than its factorization.

1641320145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12157941 (or 12157935 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1641320145 is about 40513.2095124541. The cubic root of 1641320145 is about 1179.5900483902.

The spelling of 1641320145 in words is "one billion, six hundred forty-one million, three hundred twenty thousand, one hundred forty-five".