1640951461 has 2 divisors, whose sum is σ = 1640951462. Its totient is φ = 1640951460.

The previous prime is 1640951437. The next prime is 1640951563. The reversal of 1640951461 is 1641590461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1424685025 + 216266436 = 37745^2 + 14706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640951461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640951461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640951161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820475730 + 820475731.

It is an arithmetic number, because the mean of its divisors is an integer number (820475731).

Almost surely, 2^1640951461 is an apocalyptic number.

It is an amenable number.

1640951461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640951461 is an equidigital number, since it uses as much as digits as its factorization.

1640951461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1640951461 is about 40508.6590866694. The cubic root of 1640951461 is about 1179.5017193814.

The spelling of 1640951461 in words is "one billion, six hundred forty million, nine hundred fifty-one thousand, four hundred sixty-one".