1161407381 has 2 divisors, whose sum is σ = 1161407382. Its totient is φ = 1161407380.

The previous prime is 1161407353. The next prime is 1161407431. The reversal of 1161407381 is 1837041611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151516356 + 9891025 = 33934^2 + 3145^2 .

It is an emirp because it is prime and its reverse (1837041611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161407381 is a prime.

It is a super-2 number, since 2×1161407381² = 2697734209282558322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161407321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580703690 + 580703691.

It is an arithmetic number, because the mean of its divisors is an integer number (580703691).

Almost surely, 2^1161407381 is an apocalyptic number.

It is an amenable number.

1161407381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161407381 is an equidigital number, since it uses as much as digits as its factorization.

1161407381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1161407381 is about 34079.4275333375. The cubic root of 1161407381 is about 1051.1423337841.

Adding to 1161407381 its reverse (1837041611), we get a palindrome (2998448992).

The spelling of 1161407381 in words is "one billion, one hundred sixty-one million, four hundred seven thousand, three hundred eighty-one".