1217420901 has 8 divisors (see below), whose sum is σ = 1803586560. Its totient is φ = 811613916.

The previous prime is 1217420873. The next prime is 1217420903. The reversal of 1217420901 is 1090247121.

It is not a de Polignac number, because 1217420901 - 2¹⁸ = 1217158757 is a prime.

It is a super-2 number, since 2×1217420901² = 2964227300383303602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45089663 = 1217420901 / (1 + 2 + 1 + 7 + 4 + 2 + 0 + 9 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217420903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22544805 + ... + 22544858.

It is an arithmetic number, because the mean of its divisors is an integer number (225448320).

Almost surely, 2^1217420901 is an apocalyptic number.

It is an amenable number.

1217420901 is a deficient number, since it is larger than the sum of its proper divisors (586165659).

1217420901 is an equidigital number, since it uses as much as digits as its factorization.

1217420901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45089672 (or 45089666 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1217420901 is about 34891.5591655059. The cubic root of 1217420901 is about 1067.7762361029.

The spelling of 1217420901 in words is "one billion, two hundred seventeen million, four hundred twenty thousand, nine hundred one".