3650997781 has 2 divisors, whose sum is σ = 3650997782. Its totient is φ = 3650997780.

The previous prime is 3650997761. The next prime is 3650997787. The reversal of 3650997781 is 1877990563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3545607025 + 105390756 = 59545^2 + 10266^2 .

It is an emirp because it is prime and its reverse (1877990563) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3650997781 is a prime.

It is a super-2 number, since 2×3650997781² = 26659569593733847922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3650997787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1825498890 + 1825498891.

It is an arithmetic number, because the mean of its divisors is an integer number (1825498891).

Almost surely, 2^3650997781 is an apocalyptic number.

It is an amenable number.

3650997781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3650997781 is an equidigital number, since it uses as much as digits as its factorization.

3650997781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 55.

The square root of 3650997781 is about 60423.4869980209. The cubic root of 3650997781 is about 1539.8220097039.

The spelling of 3650997781 in words is "three billion, six hundred fifty million, nine hundred ninety-seven thousand, seven hundred eighty-one".