155215761 has 16 divisors (see below), whose sum is σ = 212093184. Its totient is φ = 100923264.

The previous prime is 155215759. The next prime is 155215771. The reversal of 155215761 is 167512551.

It is a happy number.

It is not a de Polignac number, because 155215761 - 2¹ = 155215759 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155215721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42375 + ... + 45891.

It is an arithmetic number, because the mean of its divisors is an integer number (13255824).

Almost surely, 2^155215761 is an apocalyptic number.

It is an amenable number.

155215761 is a deficient number, since it is larger than the sum of its proper divisors (56877423).

155215761 is a wasteful number, since it uses less digits than its factorization.

155215761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880.

The product of its digits is 10500, while the sum is 33.

The square root of 155215761 is about 12458.5617548736. The cubic root of 155215761 is about 537.4176672882.

The spelling of 155215761 in words is "one hundred fifty-five million, two hundred fifteen thousand, seven hundred sixty-one".