155230993 has 2 divisors, whose sum is σ = 155230994. Its totient is φ = 155230992.

The previous prime is 155230987. The next prime is 155231017. The reversal of 155230993 is 399032551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117874449 + 37356544 = 10857^2 + 6112^2 .

It is a cyclic number.

It is not a de Polignac number, because 155230993 - 2¹⁷ = 155099921 is a prime.

It is a super-2 number, since 2×155230993² = 48193322375532098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155230913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77615496 + 77615497.

It is an arithmetic number, because the mean of its divisors is an integer number (77615497).

Almost surely, 2^155230993 is an apocalyptic number.

It is an amenable number.

155230993 is a deficient number, since it is larger than the sum of its proper divisors (1).

155230993 is an equidigital number, since it uses as much as digits as its factorization.

155230993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 155230993 is about 12459.1730463944. The cubic root of 155230993 is about 537.4352464268.

The spelling of 155230993 in words is "one hundred fifty-five million, two hundred thirty thousand, nine hundred ninety-three".