1121551531 has 2 divisors, whose sum is σ = 1121551532. Its totient is φ = 1121551530.

The previous prime is 1121551471. The next prime is 1121551537. The reversal of 1121551531 is 1351551211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121551531 is a prime.

It is a super-2 number, since 2×1121551531² = 2515755673376887922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1121551496 and 1121551505.

It is not a weakly prime, because it can be changed into another prime (1121551537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560775765 + 560775766.

It is an arithmetic number, because the mean of its divisors is an integer number (560775766).

Almost surely, 2^1121551531 is an apocalyptic number.

1121551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121551531 is an equidigital number, since it uses as much as digits as its factorization.

1121551531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 25.

The square root of 1121551531 is about 33489.5734669763. The cubic root of 1121551531 is about 1038.9781416976.

The spelling of 1121551531 in words is "one billion, one hundred twenty-one million, five hundred fifty-one thousand, five hundred thirty-one".