155512001 has 2 divisors, whose sum is σ = 155512002. Its totient is φ = 155512000.

The previous prime is 155511991. The next prime is 155512003. The reversal of 155512001 is 100215551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152275600 + 3236401 = 12340^2 + 1799^2 .

It is a cyclic number.

It is not a de Polignac number, because 155512001 - 2¹⁰ = 155510977 is a prime.

Together with 155512003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155512003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77756000 + 77756001.

It is an arithmetic number, because the mean of its divisors is an integer number (77756001).

Almost surely, 2^155512001 is an apocalyptic number.

It is an amenable number.

155512001 is a deficient number, since it is larger than the sum of its proper divisors (1).

155512001 is an equidigital number, since it uses as much as digits as its factorization.

155512001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 155512001 is about 12470.4451003162. The cubic root of 155512001 is about 537.7593495840.

Adding to 155512001 its reverse (100215551), we get a palindrome (255727552).

The spelling of 155512001 in words is "one hundred fifty-five million, five hundred twelve thousand, one".