3753221261 has 2 divisors, whose sum is σ = 3753221262. Its totient is φ = 3753221260.

The previous prime is 3753221231. The next prime is 3753221317. The reversal of 3753221261 is 1621223573.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3597720361 + 155500900 = 59981^2 + 12470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3753221261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3753221231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1876610630 + 1876610631.

It is an arithmetic number, because the mean of its divisors is an integer number (1876610631).

Almost surely, 2^3753221261 is an apocalyptic number.

It is an amenable number.

3753221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3753221261 is an equidigital number, since it uses as much as digits as its factorization.

3753221261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 3753221261 is about 61263.5394096685. The cubic root of 3753221261 is about 1554.0609793003.

The spelling of 3753221261 in words is "three billion, seven hundred fifty-three million, two hundred twenty-one thousand, two hundred sixty-one".