1321616473 has 16 divisors (see below), whose sum is σ = 1360941120. Its totient is φ = 1283014656.

The previous prime is 1321616437. The next prime is 1321616489. The reversal of 1321616473 is 3746161231.

It is not a de Polignac number, because 1321616473 - 2²⁹ = 784745561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321916473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1718233 + ... + 1719001.

It is an arithmetic number, because the mean of its divisors is an integer number (85058820).

Almost surely, 2^1321616473 is an apocalyptic number.

It is an amenable number.

1321616473 is a deficient number, since it is larger than the sum of its proper divisors (39324647).

1321616473 is a wasteful number, since it uses less digits than its factorization.

1321616473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its digits is 18144, while the sum is 34.

The square root of 1321616473 is about 36354.0434202304. The cubic root of 1321616473 is about 1097.4089077109.

The spelling of 1321616473 in words is "one billion, three hundred twenty-one million, six hundred sixteen thousand, four hundred seventy-three".