1316640551 has 4 divisors (see below), whose sum is σ = 1317661704. Its totient is φ = 1315619400.

The previous prime is 1316640529. The next prime is 1316640583. The reversal of 1316640551 is 1550466131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1550466131 = 20599 ⋅75269.

It is a cyclic number.

It is not a de Polignac number, because 1316640551 - 2¹⁸ = 1316378407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316640251) 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, 508640 + ... + 511221.

It is an arithmetic number, because the mean of its divisors is an integer number (329415426).

Almost surely, 2^1316640551 is an apocalyptic number.

1316640551 is a deficient number, since it is larger than the sum of its proper divisors (1021153).

1316640551 is a wasteful number, since it uses less digits than its factorization.

1316640551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021152.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1316640551 is about 36285.5419003217. The cubic root of 1316640551 is about 1096.0299174772.

The spelling of 1316640551 in words is "one billion, three hundred sixteen million, six hundred forty thousand, five hundred fifty-one".