1691345475 has 48 divisors (see below), whose sum is σ = 3158076640. Its totient is φ = 887241600.

The previous prime is 1691345473. The next prime is 1691345519. The reversal of 1691345475 is 5745431961.

1691345475 is a `hidden beast` number, since 16 + 91 + 3 + 4 + 547 + 5 = 666.

It is not a de Polignac number, because 1691345475 - 2¹ = 1691345473 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1691345475.

It is not an unprimeable number, because it can be changed into a prime (1691345473) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20637 + ... + 61713.

Almost surely, 2^1691345475 is an apocalyptic number.

1691345475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1691345475 is a deficient number, since it is larger than the sum of its proper divisors (1466731165).

1691345475 is a wasteful number, since it uses less digits than its factorization.

1691345475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41157 (or 41146 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1691345475 is about 41125.9708092101. The cubic root of 1691345475 is about 1191.4544452853.

The spelling of 1691345475 in words is "one billion, six hundred ninety-one million, three hundred forty-five thousand, four hundred seventy-five".