1487640491 has 4 divisors (see below), whose sum is σ = 1487735112. Its totient is φ = 1487545872.

The previous prime is 1487640467. The next prime is 1487640533. The reversal of 1487640491 is 1940467841.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1487640491 - 2²² = 1483446187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1487640421) 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, 17441 + ... + 57266.

It is an arithmetic number, because the mean of its divisors is an integer number (371933778).

Almost surely, 2^1487640491 is an apocalyptic number.

1487640491 is a deficient number, since it is larger than the sum of its proper divisors (94621).

1487640491 is an equidigital number, since it uses as much as digits as its factorization.

1487640491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94620.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1487640491 is about 38569.9428441371. The cubic root of 1487640491 is about 1141.5615440128.

The spelling of 1487640491 in words is "one billion, four hundred eighty-seven million, six hundred forty thousand, four hundred ninety-one".