1155400531 has 2 divisors, whose sum is σ = 1155400532. Its totient is φ = 1155400530.

The previous prime is 1155400457. The next prime is 1155400549. The reversal of 1155400531 is 1350045511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155400531 - 2¹⁹ = 1154876243 is a prime.

It is a super-2 number, since 2×1155400531² = 2669900774070163922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1155400496 and 1155400505.

It is not a weakly prime, because it can be changed into another prime (1155404531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577700265 + 577700266.

It is an arithmetic number, because the mean of its divisors is an integer number (577700266).

Almost surely, 2^1155400531 is an apocalyptic number.

1155400531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155400531 is an equidigital number, since it uses as much as digits as its factorization.

1155400531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1155400531 is about 33991.1831362193. The cubic root of 1155400531 is about 1049.3270157658.

The spelling of 1155400531 in words is "one billion, one hundred fifty-five million, four hundred thousand, five hundred thirty-one".