1155531451 has 2 divisors, whose sum is σ = 1155531452. Its totient is φ = 1155531450.

The previous prime is 1155531401. The next prime is 1155531491. The reversal of 1155531451 is 1541355511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155531451 - 2⁷ = 1155531323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155531401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577765725 + 577765726.

It is an arithmetic number, because the mean of its divisors is an integer number (577765726).

Almost surely, 2^1155531451 is an apocalyptic number.

1155531451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155531451 is an equidigital number, since it uses as much as digits as its factorization.

1155531451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 31.

The square root of 1155531451 is about 33993.1088751823. The cubic root of 1155531451 is about 1049.3666478243.

Adding to 1155531451 its reverse (1541355511), we get a palindrome (2696886962).

The spelling of 1155531451 in words is "one billion, one hundred fifty-five million, five hundred thirty-one thousand, four hundred fifty-one".