155240287 has 4 divisors (see below), whose sum is σ = 155277880. Its totient is φ = 155202696.

The previous prime is 155240263. The next prime is 155240291. The reversal of 155240287 is 782042551.

It is a happy number.

155240287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782042551 = 17 ⋅46002503.

It is a cyclic number.

It is not a de Polignac number, because 155240287 - 2⁷ = 155240159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155240257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11712 + ... + 21157.

It is an arithmetic number, because the mean of its divisors is an integer number (38819470).

Almost surely, 2^155240287 is an apocalyptic number.

155240287 is a deficient number, since it is larger than the sum of its proper divisors (37593).

155240287 is an equidigital number, since it uses as much as digits as its factorization.

155240287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37592.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 155240287 is about 12459.5460190169. The cubic root of 155240287 is about 537.4459719987.

The spelling of 155240287 in words is "one hundred fifty-five million, two hundred forty thousand, two hundred eighty-seven".