125405554 has 4 divisors (see below), whose sum is σ = 188108334. Its totient is φ = 62702776.

The previous prime is 125405537. The next prime is 125405557. The reversal of 125405554 is 455504521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 455504521 = 37 ⋅12310933.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 12089529 = 10645^2 + 3477^2 .

It is not an unprimeable number, because it can be changed into a prime (125405557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31351387 + ... + 31351390.

Almost surely, 2^125405554 is an apocalyptic number.

125405554 is a deficient number, since it is larger than the sum of its proper divisors (62702780).

125405554 is an equidigital number, since it uses as much as digits as its factorization.

125405554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62702779.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 125405554 is about 11198.4621265601. The cubic root of 125405554 is about 500.5401549219.

The spelling of 125405554 in words is "one hundred twenty-five million, four hundred five thousand, five hundred fifty-four".