1451111861 has 2 divisors, whose sum is σ = 1451111862. Its totient is φ = 1451111860.

The previous prime is 1451111821. The next prime is 1451111863. The reversal of 1451111861 is 1681111541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1043677636 + 407434225 = 32306^2 + 20185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1451111861 - 2⁶ = 1451111797 is a prime.

Together with 1451111863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1451111863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 725555930 + 725555931.

It is an arithmetic number, because the mean of its divisors is an integer number (725555931).

Almost surely, 2^1451111861 is an apocalyptic number.

It is an amenable number.

1451111861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1451111861 is an equidigital number, since it uses as much as digits as its factorization.

1451111861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 29.

The square root of 1451111861 is about 38093.4621818495. The cubic root of 1451111861 is about 1132.1404234748.

The spelling of 1451111861 in words is "one billion, four hundred fifty-one million, one hundred eleven thousand, eight hundred sixty-one".