1131515501 has 2 divisors, whose sum is σ = 1131515502. Its totient is φ = 1131515500.

The previous prime is 1131515467. The next prime is 1131515503. The reversal of 1131515501 is 1055151311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786522025 + 344993476 = 28045^2 + 18574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131515501 is a prime.

Together with 1131515503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131515503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565757750 + 565757751.

It is an arithmetic number, because the mean of its divisors is an integer number (565757751).

Almost surely, 2^1131515501 is an apocalyptic number.

It is an amenable number.

1131515501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131515501 is an equidigital number, since it uses as much as digits as its factorization.

1131515501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 375, while the sum is 23.

The square root of 1131515501 is about 33638.0067929121. The cubic root of 1131515501 is about 1042.0458682928.

Adding to 1131515501 its reverse (1055151311), we get a palindrome (2186666812).

The spelling of 1131515501 in words is "one billion, one hundred thirty-one million, five hundred fifteen thousand, five hundred one".