1001055551 has 2 divisors, whose sum is σ = 1001055552. Its totient is φ = 1001055550.

The previous prime is 1001055533. The next prime is 1001055569. The reversal of 1001055551 is 1555501001.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1001055533) and next prime (1001055569).

It is a cyclic number.

It is not a de Polignac number, because 1001055551 - 2⁶ = 1001055487 is a prime.

It is a super-2 number, since 2×1001055551² = 2004224432375827202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001055511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500527775 + 500527776.

It is an arithmetic number, because the mean of its divisors is an integer number (500527776).

Almost surely, 2^1001055551 is an apocalyptic number.

1001055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001055551 is an equidigital number, since it uses as much as digits as its factorization.

1001055551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 1001055551 is about 31639.4619265246. The cubic root of 1001055551 is about 1000.3517266072.

Adding to 1001055551 its reverse (1555501001), we get a palindrome (2556556552).

The spelling of 1001055551 in words is "one billion, one million, fifty-five thousand, five hundred fifty-one".