1640901401 has 2 divisors, whose sum is σ = 1640901402. Its totient is φ = 1640901400.

The previous prime is 1640901329. The next prime is 1640901469. The reversal of 1640901401 is 1041090461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1216335376 + 424566025 = 34876^2 + 20605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640901401 - 2²⁶ = 1573792537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1640901491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820450700 + 820450701.

It is an arithmetic number, because the mean of its divisors is an integer number (820450701).

Almost surely, 2^1640901401 is an apocalyptic number.

It is an amenable number.

1640901401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640901401 is an equidigital number, since it uses as much as digits as its factorization.

1640901401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1640901401 is about 40508.0411893737. The cubic root of 1640901401 is about 1179.4897250277.

Adding to 1640901401 its reverse (1041090461), we get a palindrome (2681991862).

The spelling of 1640901401 in words is "one billion, six hundred forty million, nine hundred one thousand, four hundred one".