42451961 has 2 divisors, whose sum is σ = 42451962. Its totient is φ = 42451960.

The previous prime is 42451957. The next prime is 42451963. The reversal of 42451961 is 16915424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41538025 + 913936 = 6445^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 42451961 - 2² = 42451957 is a prime.

Together with 42451963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42451963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225980 + 21225981.

It is an arithmetic number, because the mean of its divisors is an integer number (21225981).

Almost surely, 2^42451961 is an apocalyptic number.

It is an amenable number.

42451961 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451961 is an equidigital number, since it uses as much as digits as its factorization.

42451961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 42451961 is about 6515.5169403509. The cubic root of 42451961 is about 348.8450666009.

The spelling of 42451961 in words is "forty-two million, four hundred fifty-one thousand, nine hundred sixty-one".