1001156551 has 2 divisors, whose sum is σ = 1001156552. Its totient is φ = 1001156550.

The previous prime is 1001156543. The next prime is 1001156579. The reversal of 1001156551 is 1556511001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001156551 - 2³ = 1001156543 is a prime.

It is a super-2 number, since 2×1001156551² = 2004628879220431202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001156251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500578275 + 500578276.

It is an arithmetic number, because the mean of its divisors is an integer number (500578276).

Almost surely, 2^1001156551 is an apocalyptic number.

1001156551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001156551 is an equidigital number, since it uses as much as digits as its factorization.

1001156551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 1001156551 is about 31641.0579943212. The cubic root of 1001156551 is about 1000.3853684721.

Adding to 1001156551 its reverse (1556511001), we get a palindrome (2557667552).

The spelling of 1001156551 in words is "one billion, one million, one hundred fifty-six thousand, five hundred fifty-one".