1155315631 has 4 divisors (see below), whose sum is σ = 1223275392. Its totient is φ = 1087355872.

The previous prime is 1155315617. The next prime is 1155315649. The reversal of 1155315631 is 1365135511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155315631 - 2¹¹ = 1155313583 is a prime.

It is a super-2 number, since 2×1155315631² = 2669508414465856322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1155315593 and 1155315602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155313631) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33979855 + ... + 33979888.

It is an arithmetic number, because the mean of its divisors is an integer number (305818848).

Almost surely, 2^1155315631 is an apocalyptic number.

1155315631 is a deficient number, since it is larger than the sum of its proper divisors (67959761).

1155315631 is an equidigital number, since it uses as much as digits as its factorization.

1155315631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67959760.

The product of its digits is 6750, while the sum is 31.

The square root of 1155315631 is about 33989.9342600129. The cubic root of 1155315631 is about 1049.3013132660.

The spelling of 1155315631 in words is "one billion, one hundred fifty-five million, three hundred fifteen thousand, six hundred thirty-one".