126311961 has 4 divisors (see below), whose sum is σ = 168415952. Its totient is φ = 84207972.

The previous prime is 126311959. The next prime is 126311963. The reversal of 126311961 is 169113621.

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: 169113621 = 3 ⋅56371207.

It is an interprime number because it is at equal distance from previous prime (126311959) and next prime (126311963).

It is not a de Polignac number, because 126311961 - 2¹ = 126311959 is a prime.

It is a super-2 number, since 2×126311961² = 31909422983331042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126311963) 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, 21051991 + ... + 21051996.

It is an arithmetic number, because the mean of its divisors is an integer number (42103988).

Almost surely, 2^126311961 is an apocalyptic number.

It is an amenable number.

126311961 is a deficient number, since it is larger than the sum of its proper divisors (42103991).

126311961 is an equidigital number, since it uses as much as digits as its factorization.

126311961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42103990.

The product of its digits is 1944, while the sum is 30.

The square root of 126311961 is about 11238.8594172185. The cubic root of 126311961 is about 501.7431968003.

The spelling of 126311961 in words is "one hundred twenty-six million, three hundred eleven thousand, nine hundred sixty-one".