126973928197 has 4 divisors (see below), whose sum is σ = 126976482976. Its totient is φ = 126971373420.

The previous prime is 126973928173. The next prime is 126973928201. The reversal of 126973928197 is 791829379621.

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: 791829379621 = 7 ⋅113118482803.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126973928197 is a prime.

It is a super-2 number, since 2×126973928197² (a number of 23 digits) 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 (126973928117) 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, 1201329 + ... + 1302742.

It is an arithmetic number, because the mean of its divisors is an integer number (31744120744).

Almost surely, 2^126973928197 is an apocalyptic number.

It is an amenable number.

126973928197 is a deficient number, since it is larger than the sum of its proper divisors (2554779).

126973928197 is an equidigital number, since it uses as much as digits as its factorization.

126973928197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554778.

The product of its digits is 20575296, while the sum is 64.

The spelling of 126973928197 in words is "one hundred twenty-six billion, nine hundred seventy-three million, nine hundred twenty-eight thousand, one hundred ninety-seven".