125151661 has 4 divisors (see below), whose sum is σ = 125186332. Its totient is φ = 125116992.

The previous prime is 125151659. The next prime is 125151667. The reversal of 125151661 is 166151521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47817225 + 77334436 = 6915^2 + 8794^2 .

It is a cyclic number.

It is not a de Polignac number, because 125151661 - 2¹ = 125151659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125151667) by changing a digit.

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, 11196 + ... + 19381.

It is an arithmetic number, because the mean of its divisors is an integer number (31296583).

Almost surely, 2^125151661 is an apocalyptic number.

It is an amenable number.

125151661 is a deficient number, since it is larger than the sum of its proper divisors (34671).

125151661 is an equidigital number, since it uses as much as digits as its factorization.

125151661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34670.

The product of its digits is 1800, while the sum is 28.

The square root of 125151661 is about 11187.1203175795. The cubic root of 125151661 is about 500.2021329402.

The spelling of 125151661 in words is "one hundred twenty-five million, one hundred fifty-one thousand, six hundred sixty-one".