1641941261 has 2 divisors, whose sum is σ = 1641941262. Its totient is φ = 1641941260.

The previous prime is 1641941251. The next prime is 1641941281. The reversal of 1641941261 is 1621491461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986274025 + 655667236 = 31405^2 + 25606^2 .

It is an emirp because it is prime and its reverse (1621491461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641941261 is a prime.

It is a super-2 number, since 2×1641941261² = 5391942209148540242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641941201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820970630 + 820970631.

It is an arithmetic number, because the mean of its divisors is an integer number (820970631).

Almost surely, 2^1641941261 is an apocalyptic number.

It is an amenable number.

1641941261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641941261 is an equidigital number, since it uses as much as digits as its factorization.

1641941261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 1641941261 is about 40520.8743859261. The cubic root of 1641941261 is about 1179.7388249416.

It can be divided in two parts, 16 and 41941261, that multiplied together give a palindrome (671060176).

The spelling of 1641941261 in words is "one billion, six hundred forty-one million, nine hundred forty-one thousand, two hundred sixty-one".