1217001345 has 16 divisors (see below), whose sum is σ = 2225374080. Its totient is φ = 556343424.

The previous prime is 1217001343. The next prime is 1217001347. The reversal of 1217001345 is 5431007121.

It is an interprime number because it is at equal distance from previous prime (1217001343) and next prime (1217001347).

It is not a de Polignac number, because 1217001345 - 2¹ = 1217001343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217001343) 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, 5795140 + ... + 5795349.

It is an arithmetic number, because the mean of its divisors is an integer number (139085880).

Almost surely, 2^1217001345 is an apocalyptic number.

1217001345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1217001345 is a deficient number, since it is larger than the sum of its proper divisors (1008372735).

1217001345 is a wasteful number, since it uses less digits than its factorization.

1217001345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11590504.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1217001345 is about 34885.5463623547. The cubic root of 1217001345 is about 1067.6535605354.

Adding to 1217001345 its reverse (5431007121), we get a palindrome (6648008466).

The spelling of 1217001345 in words is "one billion, two hundred seventeen million, one thousand, three hundred forty-five".