125001155 has 4 divisors (see below), whose sum is σ = 150001392. Its totient is φ = 100000920.

The previous prime is 125001143. The next prime is 125001181. The reversal of 125001155 is 551100521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551100521 = 47 ⋅11725543.

It is not a de Polignac number, because 125001155 - 2⁸ = 125000899 is a prime.

It is a Duffinian number.

125001155 is a modest number, since divided by 1155 gives 125 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12500111 + ... + 12500120.

It is an arithmetic number, because the mean of its divisors is an integer number (37500348).

Almost surely, 2^125001155 is an apocalyptic number.

125001155 is a deficient number, since it is larger than the sum of its proper divisors (25000237).

125001155 is an equidigital number, since it uses as much as digits as its factorization.

125001155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25000236.

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

The square root of 125001155 is about 11180.3915405499. The cubic root of 125001155 is about 500.0015399953.

Adding to 125001155 its reverse (551100521), we get a palindrome (676101676).

The spelling of 125001155 in words is "one hundred twenty-five million, one thousand, one hundred fifty-five".