7505507381 has 2 divisors, whose sum is σ = 7505507382. Its totient is φ = 7505507380.

The previous prime is 7505507333. The next prime is 7505507389. The reversal of 7505507381 is 1837055057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4133847025 + 3371660356 = 64295^2 + 58066^2 .

It is a cyclic number.

It is not a de Polignac number, because 7505507381 - 2¹⁴ = 7505490997 is a prime.

It is a super-2 number, since 2×7505507381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7505507389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3752753690 + 3752753691.

It is an arithmetic number, because the mean of its divisors is an integer number (3752753691).

Almost surely, 2^7505507381 is an apocalyptic number.

It is an amenable number.

7505507381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7505507381 is an equidigital number, since it uses as much as digits as its factorization.

7505507381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147000, while the sum is 41.

The square root of 7505507381 is about 86634.3314223640. The cubic root of 7505507381 is about 1957.9128293035.

The spelling of 7505507381 in words is "seven billion, five hundred five million, five hundred seven thousand, three hundred eighty-one".