155550001 has 2 divisors, whose sum is σ = 155550002. Its totient is φ = 155550000.

The previous prime is 155549993. The next prime is 155550007. The reversal of 155550001 is 100055551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101909025 + 53640976 = 10095^2 + 7324^2 .

It is a cyclic number.

It is not a de Polignac number, because 155550001 - 2³ = 155549993 is a prime.

It is a super-2 number, since 2×155550001² = 48391605622200002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155550007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77775000 + 77775001.

It is an arithmetic number, because the mean of its divisors is an integer number (77775001).

Almost surely, 2^155550001 is an apocalyptic number.

It is an amenable number.

155550001 is a deficient number, since it is larger than the sum of its proper divisors (1).

155550001 is an equidigital number, since it uses as much as digits as its factorization.

155550001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 155550001 is about 12471.9686096462. The cubic root of 155550001 is about 537.8031472565.

The spelling of 155550001 in words is "one hundred fifty-five million, five hundred fifty thousand, one".