155987601 has 16 divisors (see below), whose sum is σ = 259304448. Its totient is φ = 81032400.

The previous prime is 155987551. The next prime is 155987609. The reversal of 155987601 is 106789551.

It is not a de Polignac number, because 155987601 - 2¹³ = 155979409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155987609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337405 + ... + 337866.

It is an arithmetic number, because the mean of its divisors is an integer number (16206528).

Almost surely, 2^155987601 is an apocalyptic number.

155987601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155987601 is a deficient number, since it is larger than the sum of its proper divisors (103316847).

155987601 is a wasteful number, since it uses less digits than its factorization.

155987601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675292.

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 155987601 is about 12489.4996296889. The cubic root of 155987601 is about 538.3069987682.

The spelling of 155987601 in words is "one hundred fifty-five million, nine hundred eighty-seven thousand, six hundred one".