1154131261 has 2 divisors, whose sum is σ = 1154131262. Its totient is φ = 1154131260.

The previous prime is 1154131259. The next prime is 1154131289. The reversal of 1154131261 is 1621314511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749719161 + 404412100 = 27381^2 + 20110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154131261 - 2¹ = 1154131259 is a prime.

Together with 1154131259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1154131361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577065630 + 577065631.

It is an arithmetic number, because the mean of its divisors is an integer number (577065631).

Almost surely, 2^1154131261 is an apocalyptic number.

It is an amenable number.

1154131261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154131261 is an equidigital number, since it uses as much as digits as its factorization.

1154131261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 1154131261 is about 33972.5074288019. The cubic root of 1154131261 is about 1048.9426274729.

Adding to 1154131261 its reverse (1621314511), we get a palindrome (2775445772).

The spelling of 1154131261 in words is "one billion, one hundred fifty-four million, one hundred thirty-one thousand, two hundred sixty-one".