125991542 has 4 divisors (see below), whose sum is σ = 188987316. Its totient is φ = 62995770.

The previous prime is 125991529. The next prime is 125991563. The reversal of 125991542 is 245199521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245199521 = 7 ⋅35028503.

It is a junction number, because it is equal to n+sod(n) for n = 125991496 and 125991505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31497884 + ... + 31497887.

It is an arithmetic number, because the mean of its divisors is an integer number (47246829).

Almost surely, 2^125991542 is an apocalyptic number.

125991542 is a deficient number, since it is larger than the sum of its proper divisors (62995774).

125991542 is an equidigital number, since it uses as much as digits as its factorization.

125991542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62995773.

The product of its digits is 32400, while the sum is 38.

The square root of 125991542 is about 11224.5954047351. The cubic root of 125991542 is about 501.3185756598.

It can be divided in two parts, 12599 and 1542, that added together give a palindrome (14141).

The spelling of 125991542 in words is "one hundred twenty-five million, nine hundred ninety-one thousand, five hundred forty-two".