155560001 has 2 divisors, whose sum is σ = 155560002. Its totient is φ = 155560000.

The previous prime is 155559991. The next prime is 155560019. The reversal of 155560001 is 100065551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87909376 + 67650625 = 9376^2 + 8225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155560001 is a prime.

It is a super-2 number, since 2×155560001² = 48397827822240002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155560021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77780000 + 77780001.

It is an arithmetic number, because the mean of its divisors is an integer number (77780001).

Almost surely, 2^155560001 is an apocalyptic number.

It is an amenable number.

155560001 is a deficient number, since it is larger than the sum of its proper divisors (1).

155560001 is an equidigital number, since it uses as much as digits as its factorization.

155560001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155560001 is about 12472.3695022237. The cubic root of 155560001 is about 537.8146717742.

The spelling of 155560001 in words is "one hundred fifty-five million, five hundred sixty thousand, one".