102057491 has 2 divisors, whose sum is σ = 102057492. Its totient is φ = 102057490.

The previous prime is 102057481. The next prime is 102057497. The reversal of 102057491 is 194750201.

It is a strong prime.

It is an emirp because it is prime and its reverse (194750201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102057491 - 2¹⁸ = 101795347 is a prime.

It is not a weakly prime, because it can be changed into another prime (102057497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51028745 + 51028746.

It is an arithmetic number, because the mean of its divisors is an integer number (51028746).

Almost surely, 2^102057491 is an apocalyptic number.

102057491 is a deficient number, since it is larger than the sum of its proper divisors (1).

102057491 is an equidigital number, since it uses as much as digits as its factorization.

102057491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 102057491 is about 10102.3507660346. The cubic root of 102057491 is about 467.3206396327.

The spelling of 102057491 in words is "one hundred two million, fifty-seven thousand, four hundred ninety-one".