126972149 has 4 divisors (see below), whose sum is σ = 127610400. Its totient is φ = 126333900.

The previous prime is 126972137. The next prime is 126972199. The reversal of 126972149 is 941279621.

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: 941279621 = 3313 ⋅284117.

It is a cyclic number.

It is not a de Polignac number, because 126972149 - 2²⁴ = 110194933 is a prime.

It is a super-2 number, since 2×126972149² = 32243853243356402, 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 (126972119) 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, 318827 + ... + 319224.

It is an arithmetic number, because the mean of its divisors is an integer number (31902600).

Almost surely, 2^126972149 is an apocalyptic number.

It is an amenable number.

126972149 is a deficient number, since it is larger than the sum of its proper divisors (638251).

126972149 is an equidigital number, since it uses as much as digits as its factorization.

126972149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638250.

The product of its digits is 54432, while the sum is 41.

The square root of 126972149 is about 11268.1919135237. The cubic root of 126972149 is about 502.6158230742.

The spelling of 126972149 in words is "one hundred twenty-six million, nine hundred seventy-two thousand, one hundred forty-nine".