7540905881 has 2 divisors, whose sum is σ = 7540905882. Its totient is φ = 7540905880.

The previous prime is 7540905857. The next prime is 7540905893. The reversal of 7540905881 is 1885090457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5718384400 + 1822521481 = 75620^2 + 42691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7540905881 is a prime.

It is a super-2 number, since 2×7540905881² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7540905851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3770452940 + 3770452941.

It is an arithmetic number, because the mean of its divisors is an integer number (3770452941).

Almost surely, 2^7540905881 is an apocalyptic number.

It is an amenable number.

7540905881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7540905881 is an equidigital number, since it uses as much as digits as its factorization.

7540905881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 7540905881 is about 86838.3894426883. The cubic root of 7540905881 is about 1960.9860616075.

The spelling of 7540905881 in words is "seven billion, five hundred forty million, nine hundred five thousand, eight hundred eighty-one".