1321613654 has 4 divisors (see below), whose sum is σ = 1982420484. Its totient is φ = 660806826.

The previous prime is 1321613653. The next prime is 1321613663. The reversal of 1321613654 is 4563161231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4563161231 = 15661 ⋅291371.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321613654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321613653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330403412 + ... + 330403415.

It is an arithmetic number, because the mean of its divisors is an integer number (495605121).

Almost surely, 2^1321613654 is an apocalyptic number.

1321613654 is a deficient number, since it is larger than the sum of its proper divisors (660806830).

1321613654 is an equidigital number, since it uses as much as digits as its factorization.

1321613654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660806829.

The product of its digits is 12960, while the sum is 32.

The square root of 1321613654 is about 36354.0046487316. The cubic root of 1321613654 is about 1097.4081274548.

Adding to 1321613654 its reverse (4563161231), we get a palindrome (5884774885).

The spelling of 1321613654 in words is "one billion, three hundred twenty-one million, six hundred thirteen thousand, six hundred fifty-four".