1490686305721 has 4 divisors (see below), whose sum is σ = 1496354314752. Its totient is φ = 1485018296692.

The previous prime is 1490686305709. The next prime is 1490686305781. The reversal of 1490686305721 is 1275036860941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1490686305721 - 2³⁹ = 940930491833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1490686305781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834004121 + ... + 2834004646.

It is an arithmetic number, because the mean of its divisors is an integer number (374088578688).

It is a 1-persistent number, because it is pandigital, but 2⋅1490686305721 = 2981372611442 is not.

Almost surely, 2^{1490686305721} is an apocalyptic number.

It is an amenable number.

1490686305721 is a deficient number, since it is larger than the sum of its proper divisors (5668009031).

1490686305721 is an equidigital number, since it uses as much as digits as its factorization.

1490686305721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668009030.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 1490686305721 in words is "one trillion, four hundred ninety billion, six hundred eighty-six million, three hundred five thousand, seven hundred twenty-one".