1891295729651 has 2 divisors, whose sum is σ = 1891295729652. Its totient is φ = 1891295729650.

The previous prime is 1891295729639. The next prime is 1891295729657. The reversal of 1891295729651 is 1569275921981.

It is a strong prime.

It is an emirp because it is prime and its reverse (1569275921981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1891295729651 - 2³⁰ = 1890221987827 is a prime.

It is a super-2 number, since 2×1891295729651² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1891295729657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945647864825 + 945647864826.

It is an arithmetic number, because the mean of its divisors is an integer number (945647864826).

Almost surely, 2^{1891295729651} is an apocalyptic number.

1891295729651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891295729651 is an equidigital number, since it uses as much as digits as its factorization.

1891295729651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 65.

The spelling of 1891295729651 in words is "one trillion, eight hundred ninety-one billion, two hundred ninety-five million, seven hundred twenty-nine thousand, six hundred fifty-one".