901218613 has 2 divisors, whose sum is σ = 901218614. Its totient is φ = 901218612.

The previous prime is 901218611. The next prime is 901218623. The reversal of 901218613 is 316812109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452753284 + 448465329 = 21278^2 + 21177^2 .

It is a cyclic number.

It is not a de Polignac number, because 901218613 - 2¹ = 901218611 is a prime.

Together with 901218611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901218611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450609306 + 450609307.

It is an arithmetic number, because the mean of its divisors is an integer number (450609307).

Almost surely, 2^901218613 is an apocalyptic number.

It is an amenable number.

901218613 is a deficient number, since it is larger than the sum of its proper divisors (1).

901218613 is an equidigital number, since it uses as much as digits as its factorization.

901218613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 901218613 is about 30020.3033462355. The cubic root of 901218613 is about 965.9249502682.

The spelling of 901218613 in words is "nine hundred one million, two hundred eighteen thousand, six hundred thirteen".