1005501251 has 2 divisors, whose sum is σ = 1005501252. Its totient is φ = 1005501250.

The previous prime is 1005501229. The next prime is 1005501271. The reversal of 1005501251 is 1521055001.

It is a happy number.

It is an a-pointer prime, because the next prime (1005501271) can be obtained adding 1005501251 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005501251 is a prime.

It is a super-2 number, since 2×1005501251² = 2022065531525130002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1005501271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502750625 + 502750626.

It is an arithmetic number, because the mean of its divisors is an integer number (502750626).

Almost surely, 2^1005501251 is an apocalyptic number.

1005501251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005501251 is an equidigital number, since it uses as much as digits as its factorization.

1005501251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1005501251 is about 31709.6397172847. The cubic root of 1005501251 is about 1001.8303979326.

Adding to 1005501251 its reverse (1521055001), we get a palindrome (2526556252).

The spelling of 1005501251 in words is "one billion, five million, five hundred one thousand, two hundred fifty-one".