125521216 has 28 divisors (see below), whose sum is σ = 249535188. Its totient is φ = 62646272.

The previous prime is 125521199. The next prime is 125521219. The reversal of 125521216 is 612125521.

It can be written as a sum of positive squares in 2 ways, for example, as 79281216 + 46240000 = 8904^2 + 6800^2 .

It is a super-2 number, since 2×125521216² = 31511151332237312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125521219) 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, 41880 + ... + 44776.

It is an arithmetic number, because the mean of its divisors is an integer number (8911971).

Almost surely, 2^125521216 is an apocalyptic number.

125521216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

125521216 is a deficient number, since it is larger than the sum of its proper divisors (124013972).

125521216 is an equidigital number, since it uses as much as digits as its factorization.

125521216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586 (or 3576 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 125521216 is about 11203.6251276094. The cubic root of 125521216 is about 500.6939909741.

Adding to 125521216 its reverse (612125521), we get a palindrome (737646737).

The spelling of 125521216 in words is "one hundred twenty-five million, five hundred twenty-one thousand, two hundred sixteen".