215290595501 has 2 divisors, whose sum is σ = 215290595502. Its totient is φ = 215290595500.

The previous prime is 215290595497. The next prime is 215290595561. The reversal of 215290595501 is 105595092512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207253473001 + 8037122500 = 455251^2 + 89650^2 .

It is a cyclic number.

It is not a de Polignac number, because 215290595501 - 2² = 215290595497 is a prime.

It is a super-2 number, since 2×215290595501² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215290595561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107645297750 + 107645297751.

It is an arithmetic number, because the mean of its divisors is an integer number (107645297751).

Almost surely, 2^215290595501 is an apocalyptic number.

It is an amenable number.

215290595501 is a deficient number, since it is larger than the sum of its proper divisors (1).

215290595501 is an equidigital number, since it uses as much as digits as its factorization.

215290595501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 44.

The spelling of 215290595501 in words is "two hundred fifteen billion, two hundred ninety million, five hundred ninety-five thousand, five hundred one".