1640514431 has 4 divisors (see below), whose sum is σ = 1641117864. Its totient is φ = 1639911000.

The previous prime is 1640514413. The next prime is 1640514439. The reversal of 1640514431 is 1344150461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1344150461 = 1151 ⋅1167811.

It is a cyclic number.

It is not a de Polignac number, because 1640514431 - 2²⁶ = 1573405567 is a prime.

It is a super-2 number, since 2×1640514431² = 5382575196638507522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640514394 and 1640514403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640514439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297620 + ... + 303081.

It is an arithmetic number, because the mean of its divisors is an integer number (410279466).

Almost surely, 2^1640514431 is an apocalyptic number.

1640514431 is a deficient number, since it is larger than the sum of its proper divisors (603433).

1640514431 is an equidigital number, since it uses as much as digits as its factorization.

1640514431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603432.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1640514431 is about 40503.2644486836. The cubic root of 1640514431 is about 1179.3969989560.

Adding to 1640514431 its reverse (1344150461), we get a palindrome (2984664892).

The spelling of 1640514431 in words is "one billion, six hundred forty million, five hundred fourteen thousand, four hundred thirty-one".