1640264131 has 8 divisors (see below), whose sum is σ = 1837741104. Its totient is φ = 1450847520.

The previous prime is 1640264117. The next prime is 1640264141. The reversal of 1640264131 is 1314620461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640264131 - 2⁹ = 1640263619 is a prime.

It is a super-2 number, since 2×1640264131² = 5380932838890370322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640264131.

It is not an unprimeable number, because it can be changed into a prime (1640264141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014660 + ... + 2015473.

It is an arithmetic number, because the mean of its divisors is an integer number (229717638).

Almost surely, 2^1640264131 is an apocalyptic number.

1640264131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1640264131 is a deficient number, since it is larger than the sum of its proper divisors (197476973).

1640264131 is a wasteful number, since it uses less digits than its factorization.

1640264131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030181.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1640264131 is about 40500.1744564144. The cubic root of 1640264131 is about 1179.3370140964.

Adding to 1640264131 its reverse (1314620461), we get a palindrome (2954884592).

The spelling of 1640264131 in words is "one billion, six hundred forty million, two hundred sixty-four thousand, one hundred thirty-one".