1627297491 has 4 divisors (see below), whose sum is σ = 2169729992. Its totient is φ = 1084864992.

The previous prime is 1627297489. The next prime is 1627297499. The reversal of 1627297491 is 1947927261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1627297491 - 2¹ = 1627297489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1627297491.

It is not an unprimeable number, because it can be changed into a prime (1627297499) 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, 271216246 + ... + 271216251.

It is an arithmetic number, because the mean of its divisors is an integer number (542432498).

Almost surely, 2^1627297491 is an apocalyptic number.

1627297491 is a deficient number, since it is larger than the sum of its proper divisors (542432501).

1627297491 is an equidigital number, since it uses as much as digits as its factorization.

1627297491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542432500.

The product of its digits is 381024, while the sum is 48.

The square root of 1627297491 is about 40339.7755447400. The cubic root of 1627297491 is about 1176.2211516906.

The spelling of 1627297491 in words is "one billion, six hundred twenty-seven million, two hundred ninety-seven thousand, four hundred ninety-one".