1121631455 has 16 divisors (see below), whose sum is σ = 1605118464. Its totient is φ = 735678240.

The previous prime is 1121631443. The next prime is 1121631499. The reversal of 1121631455 is 5541361211.

It is not a de Polignac number, because 1121631455 - 2⁴ = 1121631439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695861 + ... + 697470.

It is an arithmetic number, because the mean of its divisors is an integer number (100319904).

Almost surely, 2^1121631455 is an apocalyptic number.

1121631455 is a deficient number, since it is larger than the sum of its proper divisors (483487009).

1121631455 is a wasteful number, since it uses less digits than its factorization.

1121631455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393366.

The product of its digits is 3600, while the sum is 29.

The square root of 1121631455 is about 33490.7667126329. The cubic root of 1121631455 is about 1039.0028209966.

Adding to 1121631455 its reverse (5541361211), we get a palindrome (6662992666).

The spelling of 1121631455 in words is "one billion, one hundred twenty-one million, six hundred thirty-one thousand, four hundred fifty-five".