19501481 has 2 divisors, whose sum is σ = 19501482. Its totient is φ = 19501480.

The previous prime is 19501477. The next prime is 19501501. The reversal of 19501481 is 18410591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 8880400 = 3259^2 + 2980^2 .

It is an emirp because it is prime and its reverse (18410591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19501481 - 2² = 19501477 is a prime.

It is a super-2 number, since 2×19501481² = 760615522386722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19501451) 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, 9750740 + 9750741.

It is an arithmetic number, because the mean of its divisors is an integer number (9750741).

Almost surely, 2^19501481 is an apocalyptic number.

It is an amenable number.

19501481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19501481 is an equidigital number, since it uses as much as digits as its factorization.

19501481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 19501481 is about 4416.0481202088. The cubic root of 19501481 is about 269.1674445668.

The spelling of 19501481 in words is "nineteen million, five hundred one thousand, four hundred eighty-one".