1521494771 has 2 divisors, whose sum is σ = 1521494772. Its totient is φ = 1521494770.

The previous prime is 1521494743. The next prime is 1521494803. The reversal of 1521494771 is 1774941251.

It is a weak prime.

It is an emirp because it is prime and its reverse (1774941251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1521494771 - 2²² = 1517300467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1521494171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760747385 + 760747386.

It is an arithmetic number, because the mean of its divisors is an integer number (760747386).

Almost surely, 2^1521494771 is an apocalyptic number.

1521494771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521494771 is an equidigital number, since it uses as much as digits as its factorization.

1521494771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 1521494771 is about 39006.3427021811. The cubic root of 1521494771 is about 1150.1561907578.

The spelling of 1521494771 in words is "one billion, five hundred twenty-one million, four hundred ninety-four thousand, seven hundred seventy-one".