125243531 has 4 divisors (see below), whose sum is σ = 143135472. Its totient is φ = 107351592.

The previous prime is 125243501. The next prime is 125243543. The reversal of 125243531 is 135342521.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125243531 is a prime.

It is a super-2 number, since 2×125243531² = 31371884114695922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125243531.

It is not an unprimeable number, because it can be changed into a prime (125243501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8945960 + ... + 8945973.

It is an arithmetic number, because the mean of its divisors is an integer number (35783868).

Almost surely, 2^125243531 is an apocalyptic number.

125243531 is a deficient number, since it is larger than the sum of its proper divisors (17891941).

125243531 is an equidigital number, since it uses as much as digits as its factorization.

125243531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17891940.

The product of its digits is 3600, while the sum is 26.

The square root of 125243531 is about 11191.2256254621. The cubic root of 125243531 is about 500.3244973574.

It can be divided in two parts, 12524 and 3531, that multiplied together give a palindrome (44222244).

The spelling of 125243531 in words is "one hundred twenty-five million, two hundred forty-three thousand, five hundred thirty-one".