125621690 has 8 divisors (see below), whose sum is σ = 226119060. Its totient is φ = 50248672.

The previous prime is 125621659. The next prime is 125621731. The reversal of 125621690 is 96126521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 105001009 + 20620681 = 10247^2 + 4541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×125621690² = 31561617996912200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6281075 + ... + 6281094.

Almost surely, 2^125621690 is an apocalyptic number.

125621690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125621690 is a deficient number, since it is larger than the sum of its proper divisors (100497370).

125621690 is a wasteful number, since it uses less digits than its factorization.

125621690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12562176.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 125621690 is about 11208.1082257444. The cubic root of 125621690 is about 500.8275495678.

The spelling of 125621690 in words is "one hundred twenty-five million, six hundred twenty-one thousand, six hundred ninety".