126861289 has 4 divisors (see below), whose sum is σ = 128093056. Its totient is φ = 125629524.

The previous prime is 126861263. The next prime is 126861359. The reversal of 126861289 is 982168621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982168621 = 7 ⋅140309803.

It is a cyclic number.

It is not a de Polignac number, because 126861289 - 2²¹ = 124764137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126861209) 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, 615729 + ... + 615934.

It is an arithmetic number, because the mean of its divisors is an integer number (32023264).

Almost surely, 2^126861289 is an apocalyptic number.

It is an amenable number.

126861289 is a deficient number, since it is larger than the sum of its proper divisors (1231767).

126861289 is a wasteful number, since it uses less digits than its factorization.

126861289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231766.

The product of its digits is 82944, while the sum is 43.

The square root of 126861289 is about 11263.2716827749. The cubic root of 126861289 is about 502.4695017091.

The spelling of 126861289 in words is "one hundred twenty-six million, eight hundred sixty-one thousand, two hundred eighty-nine".