1151121531 has 16 divisors (see below), whose sum is σ = 1754681600. Its totient is φ = 657561888.

The previous prime is 1151121529. The next prime is 1151121533. The reversal of 1151121531 is 1351211511.

1151121531 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1151121529) and next prime (1151121533).

It is not a de Polignac number, because 1151121531 - 2¹ = 1151121529 is a prime.

It is a super-2 number, since 2×1151121531² = 2650161558263567922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1151121498 and 1151121507.

It is not an unprimeable number, because it can be changed into a prime (1151121533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70500 + ... + 85278.

It is an arithmetic number, because the mean of its divisors is an integer number (109667600).

Almost surely, 2^1151121531 is an apocalyptic number.

1151121531 is a deficient number, since it is larger than the sum of its proper divisors (603560069).

1151121531 is a wasteful number, since it uses less digits than its factorization.

1151121531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498.

The product of its digits is 150, while the sum is 21.

The square root of 1151121531 is about 33928.1819583661. The cubic root of 1151121531 is about 1048.0300269522.

The spelling of 1151121531 in words is "one billion, one hundred fifty-one million, one hundred twenty-one thousand, five hundred thirty-one".