1155990623 has 2 divisors, whose sum is σ = 1155990624. Its totient is φ = 1155990622.

The previous prime is 1155990601. The next prime is 1155990631. The reversal of 1155990623 is 3260995511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155990623 - 2¹⁰ = 1155989599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155990653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577995311 + 577995312.

It is an arithmetic number, because the mean of its divisors is an integer number (577995312).

Almost surely, 2^1155990623 is an apocalyptic number.

1155990623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155990623 is an equidigital number, since it uses as much as digits as its factorization.

1155990623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 1155990623 is about 33999.8621026615. The cubic root of 1155990623 is about 1049.5056245619.

The spelling of 1155990623 in words is "one billion, one hundred fifty-five million, nine hundred ninety thousand, six hundred twenty-three".