126409531 has 4 divisors (see below), whose sum is σ = 127636912. Its totient is φ = 125182152.

The previous prime is 126409523. The next prime is 126409553. The reversal of 126409531 is 135904621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135904621 = 3163 ⋅42967.

It is a cyclic number.

It is not a de Polignac number, because 126409531 - 2³ = 126409523 is a prime.

It is a super-2 number, since 2×126409531² = 31958739055279922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126409493 and 126409502.

It is not an unprimeable number, because it can be changed into a prime (126409631) 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, 613536 + ... + 613741.

It is an arithmetic number, because the mean of its divisors is an integer number (31909228).

Almost surely, 2^126409531 is an apocalyptic number.

126409531 is a deficient number, since it is larger than the sum of its proper divisors (1227381).

126409531 is a wasteful number, since it uses less digits than its factorization.

126409531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227380.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 126409531 is about 11243.1993222570. The cubic root of 126409531 is about 501.8723544921.

The spelling of 126409531 in words is "one hundred twenty-six million, four hundred nine thousand, five hundred thirty-one".