1921413751 has 2 divisors, whose sum is σ = 1921413752. Its totient is φ = 1921413750.

The previous prime is 1921413743. The next prime is 1921413761. The reversal of 1921413751 is 1573141291.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921413751 - 2³ = 1921413743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921413761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960706875 + 960706876.

It is an arithmetic number, because the mean of its divisors is an integer number (960706876).

Almost surely, 2^1921413751 is an apocalyptic number.

1921413751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921413751 is an equidigital number, since it uses as much as digits as its factorization.

1921413751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 1921413751 is about 43833.9337842270. The cubic root of 1921413751 is about 1243.1979867780.

The spelling of 1921413751 in words is "one billion, nine hundred twenty-one million, four hundred thirteen thousand, seven hundred fifty-one".