125617981 has 8 divisors (see below), whose sum is σ = 135838080. Its totient is φ = 115712448.

The previous prime is 125617969. The next prime is 125617991. The reversal of 125617981 is 189716521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 125617981 - 2¹¹ = 125615933 is a prime.

It is a super-2 number, since 2×125617981² = 31559754301032722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125617991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77811 + ... + 79408.

It is an arithmetic number, because the mean of its divisors is an integer number (16979760).

Almost surely, 2^125617981 is an apocalyptic number.

It is an amenable number.

125617981 is a deficient number, since it is larger than the sum of its proper divisors (10220099).

125617981 is a wasteful number, since it uses less digits than its factorization.

125617981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157283.

The product of its digits is 30240, while the sum is 40.

The square root of 125617981 is about 11207.9427639509. The cubic root of 125617981 is about 500.8226205154.

The spelling of 125617981 in words is "one hundred twenty-five million, six hundred seventeen thousand, nine hundred eighty-one".