1081277749 has 2 divisors, whose sum is σ = 1081277750. Its totient is φ = 1081277748.

The previous prime is 1081277663. The next prime is 1081277767. The reversal of 1081277749 is 9477721801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 987090724 + 94187025 = 31418^2 + 9705^2 .

It is an emirp because it is prime and its reverse (9477721801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1081277749 - 2²³ = 1072889141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1081277699 and 1081277708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081277149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540638874 + 540638875.

It is an arithmetic number, because the mean of its divisors is an integer number (540638875).

Almost surely, 2^1081277749 is an apocalyptic number.

It is an amenable number.

1081277749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081277749 is an equidigital number, since it uses as much as digits as its factorization.

1081277749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 1081277749 is about 32882.7880356882. The cubic root of 1081277749 is about 1026.3900233693.

The spelling of 1081277749 in words is "one billion, eighty-one million, two hundred seventy-seven thousand, seven hundred forty-nine".